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gotten from whence they were produced : when 

 fuch things are diiLOvered, I think it better to 

 preici ve ngures and defcriptions of them, than to 

 let them fink in obUvion, to which they were 

 haftening ^ becaufe, when we certainly know 

 that theie things fubfift in nature, the curio fity 

 of fome will be incited to inquire after them, in 

 order to make more full and perfed difcoveries. 

 Sir Francis Bacon has left us fomething in his 

 Advancement of Learning, pointing out the 

 means of improving fcience (which is, I think, 

 fuitablc to our prefent argument) in the follow- 

 ing lines : " Thofe things are to be held pof- 

 fible, which may be done by fome perfon, 

 though not by every one ; and which may be 

 done by many, though not by any one ; and 

 and which may be done in fucceflion of ages, 

 though not within the hour-glafs of one man's 

 " life ; and which may be done by public de- 

 *' fignation, though not by private endeavour." 



One is fomewhat conftrained in Natural Hi- 

 ilory, having only one figure of each fpecies, 

 to keep to fuch attitudes in figures as will fhew 

 all their principal parts and colours treated of ; 



other- 



