36 PROTEIN POISONS 



solvents contain fats, waxes, pigments, and possibly other 

 substances, but in this review we are interested solely in 

 the cellular proteins. 



Microscopic examination of the powdered bacterial 

 substances show the bacilli, mostly intact, though many 

 are more or less broken by the attrition to which they have 

 been subjected. The cells still take the ordinary stains, 

 but the tubercle bacillus and others of this group are no 

 longer acid-fast, showing that the property of retaining 

 the stain when washed with mineral acid is due to some 

 constituent removed by the alcohol and ether. 



