208 RECOLLECTIONS OF FORTY YEARS. 



galley manoeuvred in the ordinary way, and went at 

 least one league an hour. After the trial Garay took 

 away the whole of the machine, leaving only the wood- 

 work in the Barcelona arsenal. In spite of the opposi- 

 tion of Bavajo, the invention of Garay was approved 

 of, and but for the expedition in which Charles V. was 

 engaged standing in the way, he would no doubt have 

 favoured its adoption. As it was, the Emperor raised 

 him a step, made him a present of 200,000 maravedis, 

 and ordered the Treasury to pay all his expenses." 



Arago, referring to this in his lecture to the 

 students of the Polytechnic School, said, " As Garay 

 would not show his machine to anyone, not even to 

 the commissioners appointed by the Emperor, it is of 

 course impossible, after the lapse of three centuries, to 

 say of what it consisted. The document, exhumed 

 from the archives of Simancas, in 1825, must be put 

 on one side, first, because it was never printed ; second, 

 because there is no evidence that the motive power of 

 the Barcelona boat was steam; and thirdly, because 

 if a Garay locomotive ever existed, it was to all appear- 

 ances the Eolipylus described in the works of Hero of 

 Alexandria." 



Salomon de Caus is the author of a work entitled 

 Les Raisons des forces mouv antes avec diver ses machines 

 tant utiles queplaisantes. This work appeared at Frank- 

 fort in 1615, and it contains the following theorem 

 (No. 5) thus set forth : " Water will rise by means of 

 fire higher than its own level." The Marquis of "Wor- 



