“Oh, the little double-seated monoplane, I guess that’s in good shape, and it’s easy to manage.  When I’m out for fun I hate to be tinkering with levers and warping wing tips all the while.  The Lark practically flies herself, and we can sit back and take it easy.  I’ll have Eradicate fill up the gasolene tank, while I look at the magneto.  It needs a little adjusting, though it works nearly to perfection since I put in some of that new platinum we got from the lost mine in Siberia.”

“Yes, that was a trip that amounted to something.  I wouldn’t mind going on another like that, though we ran lots of risks.”

“We sure did,” agreed Tom, and then, raising his voice he called out:  “Rad, I say Rad!  Where are you?  I want you!”

“Comin’, massa Tom, comin’,” answered an aged colored man, as he shuffled around the corner of the shed.  “What do yo’-all want ob me?”

“Put some gasolene in the Lark, Rad.  Ned and I are going to take a little flight.  What were you doing?”

“Jest groomin’ mah mule Boomerang, Massa Tom, dat’s all.  Po’ Boomerang he’s gittin’ old jest same laik I be.  He’s gittin’ old, an’ he needs lots ob ‘tention.  He has t’ hab mo’ oats dan usual, Massa Tom, an’ he doan’t feel ’em laik he uster, dat’s a fac’, Massa Tom.”

“Well, Rad, give him all he wants.  Boomerang was a good mule in his day.”

“An’ he’s good yet, Massa Tom, he’s good yet!” said Eradicate Sampson eagerly.  “Doan’t yo’ all forgit dat, Massa Tom.”  And the colored man proceeded to fill the gasolene tank, while Tom adjusted the electrical mechanism of his aeroplane, Ned assisting by handing him the tools needed.  Eradicate, who said he was named that because he “eradicated” dirt, was a colored man of all work, who had been in the service of the Swift household for several years.  He and his mule Boomerang were fixtures.

“There, I guess that will do,” remarked Tom, after testing the magneto, and finding that it gave a fat, hot spark.  “That ought to send us along in good shape.  Got all the gas in, Rad?”

“Every drop, Massa Tom.”

“Then catch hold and help wheel the Lark out.  Ned, you steady her on that side.  How are the tires?  Do they need pumping up?”

“Hard as rocks,” answered Tom’s chum, as he tapped his toe against the rubber circlets of the small bicycle wheels on which the aeroplane rested.

“Then they’ll do, I guess.  Come on now, and we’ll give her a test before we start off.  I ought to get a few hundred more revolutions per minute out of the motor with the way I’ve adjusted the magneto.  Rad, you and Ned hold back, while I turn the engine over.”

The youth and the colored man grasped the rear supports of the long, tail-like part of the monoplane while Tom stepped to the front to twist the propeller blades.  The first two times there was no explosion as he swung the delicate wooden blades about, but the third time the engine started off with a roar, and a succession of explosions that were deafening, until Tom switched in the muffler, thereby cutting down the noise.  Faster and faster the propeller whirled about as the motor warmed up, until the young inventor exclaimed: