IX 



the modes of dissecting and examining objects, more 

 especially valuable for such analysis ; but with regard 

 to the former considerations, he has at present left them 

 untouched ; and with respect to the latter, as the author 

 was well aware of the exigencies of time felt by those 

 who, he imagined, might constitute the greater portion 

 of his readers, he has thought it better to recommend 

 to them the beautiful preparations to be obtained from 

 Mr. Pritchard the optician; in which the elementary 

 structure of the commonest or the rarest, the smallest 

 or the largest vegetable body may be minutely examined. 

 There are, on the other hand, some things which the 

 author regrets not having had in his power to make 

 use of for the present work, such as the paper of Schlei- 

 den upon Phytogenesis, of Unger upon Spermatic Ani- 

 malcules, and the yearly report of Meyen, etc., all of 

 which reached the author too late for administering to 

 the utility in which he hopes the following pages will 

 not be materially deficient. 



Charing Cross Hospital, 

 October 1839. 



