192 Huber: Method of preparing large Nurabers of Sections. XXIII, 2. 



A Solution of equal parts of rock-candy and 



distilled water 300 cc 



A Solution of equal parts of dextrin and di- 

 stilled water 100 „ 



Absolute alcohol 200 „ 



Mix the siigar and dextrin Solutions in mortar and while con- 

 stantly stirring add slowly tlie absolute alcohol. Filter througli 

 absorbant cotton ; this niay be liastened by attacliing the receiving 

 bottle to a Chapman's suction pump. 



A desired mimber of glass-plates may be coated on one side 

 with a thin layer of this Solution, and placed horizontally for several 

 hours to enable the Solution to dry partially, when the plates are 

 ready for further use. A simpler and more convenient method, 

 however, is the following. — A sufficient amount of the sugar-dextrin 

 is added to the distilled water of the tray to make of this a 3 ''/q 

 to 5^/q sugar-dextrin Solution in which case it is not necessary to 

 coat the plates with the sugar-dextrin Solution. A glass-plate coated 

 with the sugar-dextrin Solution is placed in the water of the tray 



