334 Microscopical Essays. 



A better view of mod obje&s is obtained by a candle, or lamp, 

 than by day-light ; it is more eafy to modify the former than the 

 latter, and to throw it on the obje£l with different degrees of 

 denfity. From what has been faid, the reader will have obferved 

 the importance of being able to examine the objeft in the greateft 

 variety of pofitions and appearances, which cannot --be effected 

 with equal convenience by any microfcope but the improved 

 lucernal. 



Of the Preparation of Objects for the Microscope. 



In the preparation of objecls, no man was more fuccefsful nor 

 more indefatigable than Swammerdam, in minutely anatomizing, 

 in patient inveftigation, and in curioufly exhibiting the minute 

 wonders of creation ; he Hands unrivalled, far exceeding all thofe 

 that preceded, as well as thofe which have fucceeded him. 

 Deeply impreffed and warmly animated by the amazing fcenes 

 that he continually difcovered, his zeal in purfuit of truth was 

 not to be abated by difappointment, or alarmed by difficulty ; 

 and was never contented till he had attained a rational and clear 

 idea of the organization of the objea, whofe ftrudure he wifhed 

 to explore. 



We have only to regret that we are ignorant of the methods he 

 employed. To difcover thefe, the great Boerhaave examined 

 with a fcrupulous attention all the letters and manufcripts of 

 Swammerdam, and has communicated the refult of his refearches, 

 which, though but fmall, may enable us to form feme idea of 

 this great labourer in the field of fcience. 



For 



