:: ir.rr : 



:I:-.T:- - r:i "i :_i". ; .:.-:..-. : ir. 



On 



the experimental cvi- 

 that as a result both 

 to the more recent 



n . r: : rr =_i i 



: - ; ~: : ' : : 



or destroyed the 

 To this substance they give the 

 It led to the 



.-.-;.: ------- 



- - .:- -.>..:- 



They are readily destroyed 



(65* to 75 s C) and by ezoosiire to 



to acidi ir.-; >re '.^t preserved 



Kdtodi 

 a vacmmL, at a low 



