THE MICROSCOPE. 



17 



then the spring clips shown upon the stage are useful to retain 

 the object in its place. Numerous convenient appendages may 

 be made to accompany such microscopes, which it will be im- 

 possible to mention in detail; the most useful are Mr. Varley's 

 capillary cages for containing animalculae in water, and parts of 

 aquatic plants; also his tubes for obtaining and separating such 



Jb';g. 10. 



objects, and his phial and phial-holder for preserving and ex- 

 hibiting small living specimens of the Chara, Nitella, and other 

 similar plants, and observing their circulation. The phial- 

 microscope affords facilities for observing the operations of 

 minute vegetable and animal life, which will probably lead 

 to the most interesting discoveries. The recent volumes of 

 the Transactions of the Society of Arts contain an immense 



