88 



Animal Microloyy 



be used to dilute it, but it is advisable to use only fresh gold size 

 if it is obtainable. 



4. The slide must be set aside to dry before it can be used for 

 mounting. A gentle heat will aid in drying. 



FIG. 36. Turntable. 



5. To some of the cells add successive coats of gold size as the 

 previous one dries, so that you will have cells of varying depth. 



II. MOUNTING IN GLYCERIN 



A. Water Mites and Transparent Larvae. 1. Kill several 

 small, colored water mites or transparent larvae of insects by 

 means of chloroform (a few drops in water) and place them for 

 half an hour (two or three hours for larger objects) into a mixture 

 of water and glycerin equal parts, after which transfer them to 

 pure glycerin, 



2. Apply a thin coat of gold size to the upper edge of a cell 

 which is of sufficient depth to accommodate the object. 



3. Breathe into the cell to moisten it so that the glycerin will 

 adhere throughout and prevent the formation of air-bubbles. 



4. Fill the cell flush with glycerin and put the object into it, 

 carefully spreading out all parts. 



5. Breathe on the lower surface of a clean cover-glass, put one 

 edge down on the edge of the cell and then gradually lower the 



