MICROSCOPIC OBJECTS. 139 



side of the body, by means of fine scissors. When the 

 skin is cleaned, it must be laid out on a glass slider 

 under water ; another slider must be covered over it, and 

 the two bound together wliile the skin is dry — when it is 

 ready for mounting. 



To Prepare the Respiratory, Digestive, and other internal 

 Organs of Insects. — These subjects must be opened by 

 fine scissors along the dorsal surface, and the various 

 organs to be dissected out must be operated upon under 

 water. A glass slide is then gently introduced into the 

 vessel, and the organ, being floated upon it, is to be 

 arranged thereon in such a manner that when dry and 

 mounted its form and structure can be readily viewed by 



the microscope. A^o^e.— Delicate objects of this kind 



must be slowly dried without a glass slide over them. 



To Prepare Butterflies, other Insects, Spiders, 8^c. etitire. 

 — When these are large they require the exercise of much 

 patience. Take out the inside as carefully as possible, by 

 making an opening near the tail; lay out the specimen 

 on a glass shde, (two inches wide by three inches long is 

 the most convenient for butterflies) ; extend the wings, 

 legs, and antennse, and keep them in a proper position by 

 af&xing them with a little gum-water, if necessary, or, 

 what is better, pour a little turpentine over the whole ; 

 cover them with another glass slider, and bind them 

 together until flattened and dry — when they are ready for 

 mounting. 



To Prepare the Shells of Fossil Infusoria. — These 

 usually consist of sihca, and are mostly found mixed with 



