REACTIONS OF FIXATIVES WITH PROTEINS. 2 65 



(or thereabouts). On the less acid side (for example, the unacidified 

 sodium or ammonium salts), the acetate ion is not fixative, but 

 macerates badly; on the more acid side there is coagulation of 

 nucleoprotein, or separation of DXA from combination with 

 protein with immediate precipitation. 



No attempt will be made to give a general account of the fixation 

 of lipids and carbohydrates, because these substances are not 

 stabilized by most fixatives. The reactions of particular fixatives 

 with them will be mentioned in chapters 5 and 6. 



^ 



^ . >r 



'>-'^'rv, 



^'^i<Ariy I 3U, 



