INDEX. 



the Imperfeflions and ftrufture of 

 fpeculums, ib. — On achromatic eye- 

 pieces, 191. — On the art of fwimming, 

 325. — On tlie Fata Morgana at fea, 

 341 

 Wollafton, Dr» his platina crucibles, 135 



Y. 



Young, Dr. his eflay on the cohefion of 

 fluids 74> 158. — Note from, recom- 

 mending the tranflacion of a memoir pf 

 M. Laplace, 247. 



END 01- IHfc FOtlRTf:ENTH VOLUME. 



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