74 



NATURALISTS' ASSISTANT. 



for laboratory purposes. Its construction is readily seen from 

 fig. 27. It consists of a shallow tray with a series of steps, 

 the bottles being held in place by rods running along the case. 

 When a row is not full, the vials are fastened by a wedge. 



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V 



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y\->^A-^ *^-s 



FIG. 27. 



This form may stand on the laboratory table or can hang 

 against the wall as desired. They can also be hinged to- 

 gether in pairs, labelled and placed on shelves. 



