APRIL, 1906. THE CHEMICAL NATURE 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. 
TABLE II. 
Table Showing- Relative Amount of Formic Acid Per Weight of Ant in 
Various Species. 
Formica fusca 
worker 
.005 
.1268 
female 
030 
.0109 
Camponotus 
sansabeanus 
worker major 
.041 
.0534 
worker minor 
.009 
0506 
Camponotus 
fumidus 
worker major 
.020 
.0814 
worker minor 
.005 
.0832 
Camponotus 
americanus 
.005 
.0478 
Pachycondyla 
harpax 
.013 
.0160 
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 Myrmecocystus is tested in a similar way, it 
will show a still greater amount, as its acid odor is much more 
intense. 
