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EXPERIMENTAL PHARMACOLOGY 



soldering the edges together as above described. The 

 method is quite similar to that which one would employ if 

 he desired to make a pasteboard case to cover an irregularly 

 shaped object such as an ink bottle. He would simply cut 

 out pieces of the pasteboard to fit the various surfaces of 



Fig. 378. First step in the making of small "straight" glass cannulas. 



Fig. 379. The "shoulders" of the cannulas are carefully heated in a needle-pointed flame 

 and drawn out a little to form the "necks" on the two cannulas. 



Fig. 380. The points of the cannulas are broken off at the file marks and the large 

 end of each cannula is rounded in the flame. 



the bottle, bending those which covered curved areas, and 

 then he would fasten the edges together with glue or 

 mucilage. 



Pieces of iron may be brazed by heating them red hot, 

 covering the areas to be brazed with powdered borax 

 (which promptly melts) and then putting small pieces of 



