APRIL, 1906. THE CHEillCAL NATUBE OF SOME INSECT SECRETIONS. 



31 



As these data are wholly independent of the size of the ants 

 they give a poor idea of the relation between the amount of acid 

 and the weight of the ant. This is obviated in the following table, 

 which is derived from the one given above by dividing the actual 

 amount per ant by the weight of the ant itself in grams. 



TABIvE II. 



Table Showing Eelative Amount of Formic Acid Per Weight of Ant in 



Various Species. 



It is seen that Formica heads the list, containing more 

 than twice as much acid relative to its size as the species of 

 Camponotus examined and which follow it in the list. We believe, 

 however, that when Myrjnecocystus is tested in a similar way, it 

 will show a still greater amount, as its acid odor is much more 

 intense. 



