rocket fuel that wasn't one—had been turned over to the United States Government and had proved to be something already known and discarded because it was too expensive for practical use.

As he explained very carefully to Mitkey, "It iss burely a matter of absolute accuracy and mathematical correctness, Mitkey. Idt iss all here—ve merely combine—and ve achieff vhat, Mitkey?

"Eggscape velocity, Mitkey! Chust barely, it adds up to eggscape velocity. Maybe. There are yet unknown facgtors, Mitkey, in der ubper atmosphere, der troposphere, der stratosphere. Ve think ve know eggsactly how mudch air there iss to calculate resistance against, but are ve absolutely sure? No, Mitkey, ve are not. Ve haff not been there. Und der marchin iss so narrow that so mudch as an air current might affect idt."

But Mitkey cared not a whit. In the shadow of the tapering aluminum-alloy cylinder he waxed fat and happy.

"Der tag, Mitkey, der tag! Und I shall not lie to you, Mitkey. I shall not giff you valse assurances. You go on a dancherous chourney, mein little friendt.

"A vifty-vifty chance ve giff you, Mitkey. Not der moon or bust, but der moon und bust, or else maybe safely back to earth. You see, my boor little Mitkey, der moon iss not made of green cheese und if it were, you vould not live to eat it because there iss not enough atmosphere to bring you down safely und vith your viskers still on.

"NOT DER MOON OR BUST, BUT DER MOON UND BUST!"

"Und vhy then, you may vell ask, do I send you? Because der rocket may not attain eggscape velocity. Und in that case, it iss still an eggsperiment, budt a different vun. Der rocket, if it goes not to der moon, falls back on der earth, no? Und in that case certain instruments shall giff us further information than ve haff yet about things up there in space. Und you shall giff us information, by vether or not you are yet alife, vether der shock absorbers und vanes are sufficient in an earth-equivalent atmosphere. You see?

"Then ladter, vhen ve send rockets to Venus maybe vhere an atmosphere eggsists, ve shall haff data to calculate the needed size of vanes und shock-absorbers, no? Und in either case, und vether or not you return, Mitkey, you shall be vamous! You shall be der virst liffing greature to go oudt beyond der stratosphere of der earth, out into space.

"Mitkey, you shall be der Star-Mouse! I enfy you, 

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