POWDERED DRUGS AND FOODS. 



799 



molybdate solution, stirring well with a glass rod, small, yellow, 

 diamond-shaped crystals are observed, which are permanent in 

 glycerin mounts. 



Fig. 322. A. Cantharides (Cantharis vesicatoria): abd, fragments of abdomen; ai. 

 fragments of wings; ac, fragments of mites; el, fragments of elytra showing the external 

 surface; eli, fragments of elytra showing internal surface, when cleared with Javel water; 

 m, fragments of muscles; in, undetermined fragments; oa, eggs of mites; p, hairs from 

 abdomen, thorax and wings. After Collin. 



265. CALCII SULPHAS. In glycerin mount alone needle- 

 shaped crystals, or long crystals in masses which look like a group 

 of sclerenchyma fibers, are observed. 



