112 



MEMORANDA. 



added, with its numerous apertures, and which can he A'ai*ied 

 to suit the fancy, we get an apparatus which, on important 

 occasions, will be found to fill the place of the more expen- 

 sive achromatic condenser. 



Fig. 3. 



The second contrivance of wliich I have to speak is a 

 clasp to hold bottles at the end of the rod with which the 

 searcher for minute organisms is provided. Many micro- 

 scopists have found the ordinary contrivances, for this pur- 



Fig. 4. 



