CONSTRUCTION OP THE MICROSCOPE. 



simple lenses or doublets; or it could be easily con* 

 rasted into a compound microscope by inserting a com- 

 d body, supported on a bent arm, in the place of the 

 - carrying the single lenses. 



An arrangement devised by the late Mr. Quekett, for a 

 microscope, represented in fig. 25, is one of value 



Simple Microscope. 



and convenience. The instrument is made by Mr. Ladd 

 rf Beck Street, and is furnished by him with three mag- 

 aiSers, namely, an inch, and half-inch, ordinary lenses, 

 aacf a quarter-inch Coddington ; these will be found to be 

 ffa powers most useful for the purposes to which this 

 affltniment is specially adapted. The lenses, mirror, con- 

 dtaer, vertical stem, &c., all fit into hollows cut for their 

 MMpticna:on the under side of the stage, and are then 

 cowered and kept in place by the side flaps : so that, when 

 Befced together, and the flaps kept secure by an. India 

 BBbberjbaiid, the instrument is very conveniently portable. 

 Wfr size and firmness of the stage afford great, facilities 

 for dissection, and other scientific investigations. 



"EttEJCoMPouND MICROSCOPE. The compound microscope 

 awy, as before stated, consist of only two lenses, while a 

 aple microscope has been shown to contain sometimes 

 flfcse. In the triplet for the simple microscope, however, 

 ^rwa* explained that the object of the first two lenses was/ 



