APPARATUS, MATERIAL, AND RKAliKNTS. 





Collapsible tubes, for containing Canada balsam ; very serviceable for 

 transport and general use. 



Turn-table for sealing cover-glass preparations, with rings of cement. 



Boxes for preparations, book-form. 



Tickets and labels, various sizes. 



Soft rags or old pocket-handkerchiefs, for removing cedar oil from 

 immersion lens, cleaning cover-glasses, etc. 



Chamois leather for wiping lenses. 



Warm Stages. In addition to those already described, Schafer 

 and Strieker have constructed warm stages for accurate observ; 

 Schafers apparatus consists of a vessel (/), filled with water 

 has been boiled to expel the air, and heated by means of a ga^ 

 at g. The warmed water ascends the indiarubber tube (c) to the 



Fl(; M6. 



WARM STAGE. 



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