480 THE CENTURY, 



that are underneath, will breathe forth at the mouth of 

 the cock ;&quot; but, on being partially turned, &quot; then there 

 being no vent for the ay re to breath out at, it will 

 presse the water, and force it to ascend the pipe, and 

 issue out where the air breathed before/ In con 

 clusion he shrewdly remarks : u Oilier devices and 

 those more strange in their effects, may be contrived from 

 hence.&quot; (p. 33, 34.) 



In the &quot; Eecreation Mathematique&quot; of H. van Etten, 

 1629, 12mo. of which there were translations in several 

 editions, as 1633, 1653, and others, the 67th problem is 

 descriptive &quot; Of the properties of ^Eolipiles or bowels 

 to blow the fire.&quot; In the course of the article on this 

 subject it is observed : &quot; Vitruvius, in his first book of 

 Architecture, cap. 8, approves from these engines, 

 that winde is no other thing than a quantity of vapours 

 and exhalations agitated with the aire by rarefaction 

 and condensation ;&quot; a remark curious enough, if only 

 for the last word &quot; condensation! 7 The article con 

 cludes &quot; Now it is cunning and subtiltie to fill one of 

 these ^Eolipiles with water at so little a hole, and 

 therefore requires the knowledge of a philosopher to 

 finde it out ; and the way is thus : Heat the ^Eolipiles 

 being empty, and the aire which is within it will 

 become extreamely rarefied ; then being thus hot throw 

 it into water, and the aire will begin to be condensed : 

 by which meanes it will occupie lesse roome, therefore 

 the water will immediately enter in at the hole to 

 avoide vacuitie : thus you have some practicall specula 

 tion upon the ^Eolipile.&quot; 



Here we have &quot; condensation&quot; a second time ad 

 verted to, while the whole experiment proves the folly 

 of attributing to Savery a similar result as a novelty 

 leading for the first time to a knowledge of the pro 

 perty of &quot; condensation,&quot; to the disparagement of the 



