“washington! i say washington!”

throughout a big shed, filled for the most part with huge pieces of machinery, echoed the voice of professor amos henderson. he did not look up from a small engine over which he was bending.

“washington! where are you? why don’t you answer me?”

from somewhere underneath an immense pile of iron, steel and aluminum came the voice of a colored man.

“yas sir, perfesser, i’se goin’ t’ saggasiate my bodily presence in yo’ contiguous proximity an’ attend t’ yo’ immediate conglomerated prescriptions at th’ predistined period. yas, sir!”

“well, washington, if you had started when you began that long speech you would have been at least half way here by this time. hurry up! never mind tightning those bolts now. find the boys. i need them to help me with this engine. they must be around somewhere.”

“i seen ’em goin’ fishin’ down by th’ brook a little while ago,” answered the negro, crawling out from under what seemed to be a combined airship and watercraft. “jack says as how yo’ gived him permission t’ occupy his indisputatious period of levity in endeavorin’ t’ extract from th’ liquid element some specimens of swimmin’ creatures.”

“if you mean i said he and mark could go fishing in the brook, you’re right, washington,” replied the professor with a smile. “but you waste a lot of time and breath trying to say it. why don’t you give up using big words?”

“i reckon i was brought up t’ it,” replied the colored man grinning from ear to ear. he did not always use big words but when he did they were generally the wrong ones. sometimes, he spoke quite correctly.

“well, i suppose you can’t help it,” resumed mr. henderson. “however, never mind that. find the boys and send them to me.”

“with th’ least appreciatableness amount of postponement,” answered the messenger, and he went out.

washington white, who in color was just the opposite to his name, a general helper and companion to professor henderson, found mark sampson and jack darrow about a quarter of a mile from the big shed, which was in the center of a wooded island off the coast of maine. the lads were seated on the bank of a small brook, fishing.

“perfesser wants yo’ immediate,” said washington.

“but we haven’t caught a single fish,” objected mark.

“them’s the orders from headquarters,” replied the colored man. “yo’ both got t’ project yo’selves in th’ vicinity of th’ machine shop. i reckon th’ new fangled contraption that th’ perfesser is goin’ t’ navigate th’ air an’ sail th’ angry seas in, am about done. he want’s t’ try th’ engine.”

“come on then,” said jack. “we probably would not catch any fish, anyhow, mark.”

accompanied by washington, the youths, each of whom was about eighteen years old, started toward the big shed.

while they are on their way opportunity may be taken to tell a little about them, as well as about washington and the professor, and the curious craft on which the scientist was working.

a few years before this story opens mr. henderson had invented a wonderful electric airship. he had it about completed when, one day, he and the two boys became unexpectedly acquainted, and, as it developed, friends.

mark and jack were orphans. after having rather a hard time knocking about the world trying to make a living, they chanced to meet, and resolved to cast their lots together. they boarded a freight train, and, as told in the first volume of this series, entitled, “through the air to the north pole; or the wonderful cruise of the electric monarch,” the cars were wrecked near where professor henderson was building his strange craft.

the boys were cared for by the scientist, and, after their recovery from hurts received in the collision, they accepted his invitation to make the trip through the upper regions in the airship, to search for the north pole. with them went andy sudds, an old hunter, and tom smith and bill jones, two farmers, but who were hired as helpers on the voyage. the party had many adventures on the trip, having battles with savage animals and more savage esquimaux, and were tossed about in terrible storms. after making some scientific observations, which the professor was much interested in, they started back home.

having found he could successfully sail in the air, mr. henderson resolved to try what it might be like under water.

he moved his machine shop to a lonely spot on the maine coast, and there, with the help of the boys, washington, andy and two machinists constructed a submarine boat, called the porpoise.

in this the professor resolved to seek the south pole, he having a theory that it was surrounded by an open sea. after much hard work the porpoise was made ready for the voyage.

what occurred on this great trip is described in the second book of this series, called “under the ocean to the south pole, or the strange cruise of the submarine wonder.” in that is told how once more tom and bill, with andy, the boys and washington, accompanying professor henderson, had many thrilling experiences.

they were caught in the grip of the grass of the terrible sargasso sea. monstrous suckers grasped the boat in their powerful arms, and had to be fought off. they were caught in a sea of boiling water and imprisoned between big fields of ice.

by means of strong diving suits they were able to leave the ship and walk about on the bottom of the sea. they visited a graveyard of sunken ships, saw many strange monsters as well as many beautiful fish in the great depths to which they sunk. many times they were in dire peril but the resources of the professor, the bravery and daring of the boys, no less than the help washington and andy sudds, the hunter, rendered at times, brought them through.

those of you who read of their adventures will recall the strange island which they came upon in the atlantic ocean, far from the coast of south america.

when they first drew near this island they were almost sucked into the depths of a great whirlpool, caused by water pouring down a big hole that seemed to lead far into the earth. they reversed their ship just in time.

but, on going to another side of the island they were able to approach safely, as at this point the great hole was farther from the shore. then they landed and investigated.

they found the island was almost circular, and the hole was also round, but not in the center of the land. it was an immense cavity, so wide they could not see across, and as for the depth they could only guess at it. looking down they could only see rolling masses of vapor and clouds caused by the water which poured down from the ocean with the force of a niagara.

gazing down into the big hole mark suggested it might lead to the centre of the earth, which some scientists claim is hollow. the professor admitted that the cavity looked as though it led to china.

they had no means of investigating further the mystery of the opening and returned to their submarine, completing the voyage to the south pole.

it was now about two years since they had come back from that eventful trip. one of the first things the professor did, after docking the porpoise, was to shut himself up in his study and begin to draw plans. to the questions of the boys he returned no answer for several days. then he announced he was working on a craft which could both sail on top of the water and navigate the air.

in time the plans were done, and, in order to keep the work secret, the shop was moved to an island which the professor owned.

parts of the monarch and the porpoise were used in constructing the new craft, so there was no need to get other help than that which the boys, washington and bill and tom could give, since the two latter accepted an offer of the professor to remain and work for him. the boys, of course, would not leave their friend.

the professor realized that he had a more difficult task in his new venture than he had set himself on other occasions. for a ship to be light enough to rise in the air, and, at another time, and with no change, to be strong enough to navigate the ocean, was indeed something to tax mr. henderson’s ingenuity.

however, in the course of a little over a year the larger part of the work was done. inside the big shed was the huge affair which, it was hoped, would enable its owner to be master of both air and water.

“did the professor say anything special?” asked mark of washington.

“nope. i reckon he were too busy problamatin’ the exact altitude projected in an inverse direction by th’ square root of th’ new engine when operated at a million times inside of a few seconds, but he didn’t say nothin’ t’ me. i were busy underneath th’ ship, fixin’ bolts when he tole me t’ find yo’. i wouldn’t be s’prised if he had th’ thing goin’ soon.”

“do you think he’ll be generating the new gas to-day?” asked jack eagerly. “that’s the most troublesome part; to get that gas right.”

“he didn’t say nothin’ t’ me 'bout it,” washington stated, as he walked along beside the two boys. “he jest seemed anxious like.”

“we’d better hurry,” advised mark. “he may be at an important part in his experiments and probably needs us. i hope it will work. he has spent many days on it, and we all have worked hard. it ought to be a success.”

“perfesser allers makes things work,” declared washington stoutly.

“that’s a good way to feel about it, anyway,” observed mark. “well, we’ll soon know.”

the three hurried to the shed which they could see as they rounded a turn of the path through the wood. they noticed an elderly man approaching with a gun on his shoulder. on one arm he carried a game bag.

“guess andy got something for dinner,” remarked jack.

“i hopes so, honey,” put in washington. “i’se got a sort of gone feelin’ in my stomach!”

“any luck, andy?” called mark, when he came within hailing distance.

“fine,” replied andy sudds. “rabbits and quail. we’ll have a good dinner to-morrow.”

while andy entered the living part of the big shed to put away his gun and game, the boys and washington kept on to the engine room. they found the professor, with bill and tom, busy fitting pipes to the small engine which was set up at one side of the structure.

“come, boys, i need your aid,” remarked mr. henderson as they entered. “take off your coats and pitch in. tighten up these bolts, jack. mark, you mix up those chemicals the way i taught you, and see that the dynamo is in working order for washington to attend to.”

in a little while the shop was a veritable hive of industry, and it resounded to the sound of hammers, wrenches and machinery. in the background was the big ship, which seemed like two immense cigars, one above the other, the lower one the larger.

“where was you calalatin’ t’ take this here ship when it gits done, perfesser?” asked washington, during a lull in the operations.

“do you remember that big hole in the island we visited on our trip to the south pole?”

“i suah does,” answered the colored man.

“we are going to explore that,” went on the scientist. “we are going to make a voyage to the interior of the earth in our flying mermaid.”

“go down into th’ earth!” exclaimed washington, his eyes big with fright.

“certainly; why not?”

“not for mine!” cried the colored man, dropping the wrench he was holding. “no sir! i’m not goin’ t’ project myself int’ a grave while i’se alive. time enough when i kicks th’ bucket. no sir! if yo’ an’ the boys wants t’ risk yo’ se’ves goin’ down int’ th’ interior of th’ earth, where th’ bible says there’s fiery furnaces, yo’ kin go, but washington white stays on terra cotta! that’s where he stays; he ain’t ready t’ be buried, not jest yet!” and the frightened colored man started to leave the shed.