XI 



Explanation of Figures. 



A. Front view of measuring apparatus. 



B. Side view and stand. 



C. Front view of pedals. 



D. Side view 



E. Erlenmeyer flask for overflow. 



(a) I 



> the two positions of stopcock. 



(b) I 



(c) graduated pipettes. 



(d) screw clamp (double). 



(e) four way stopcock. 



(f) axis on which pedals act. 



(g) support attaching measuring apparatus to stand. 

 (h) metal stand. 



(i) white enamelled metal plate, 

 (k) strong clamp. 

 (1) overflow tube. 

 (m,!!! 1 ) branched tube. 

 (n) bent tube. 



