266 THE MONTHLY BULLETIN. 



COMPATIBILITY TABLE— I NSECTICI DES AND FUNGICIDES. 



KEY TO CLASSIFICATION. 



A-1 Better results by mixing. { 



A Properties not changed by mixing. ^ 



B EflSeient, non-injurious. ] 



C Inefficient, non-injurious. 



D Dangerous mixtures. J 



Compatible. 



[-Incompatible, chemically. 



DEFINITIONS. 



The word "compatibility" or its opposite "incompatibility" may 

 seem odd as used iii this connection, but it seemed to be the best word 

 that presented itself, in the sense to be later described. "Incom- 

 patibility or temperament" is a phrase often seen in the newspapers 

 and its meaning may be described as a state of affairs in which trouble 

 is precipitated whenever two opposing tempers come in contact. 

 Incompatibility is the state of being incompatible. In pharmacy, the 

 terms are often used and usually a whole chapter is devoted to the sub- 

 ject in works on the practice of pharmacy. As applied to medicine, 

 incompatibility is of three different types and may be defined as follows : 



Incompatibie : (1) Chemically — Not capable of being united in 

 solution without liability to decomposition or other chemical change. 



(2) Therapeutically — Not suitable to be prescribed together because 

 of opposing medicinal qualities. 



(3) Physically — Not suitable to be mixed on account of liability to 

 produce undesirable physical change. 



In a broad sense, it seems that the word may be applied to insecticides 

 and fungicides. The distinctions made between the different sorts of 

 incompatibilities as applied to pharmacy might also be applied in a 

 general way to spray mixtures. To avoid technicalities, however, it 

 seems best to divide mixtures of insecticides and fungicides into five 

 classes designated by letters. 



