DIVISION OF LABOUR. 45 
this is self-evident, but even in species where the 
workers are all of one type, something of the same 
kind appears to occur. 
In the autumn of 1875 I noticed an ant belonging 
to one of my nests of F. fusca out feeding alone. The 
next day the same ant was again out by herself, and for 
some weeks no other ant, so far as I observed, came out 
to the food. I did not, however, watch her with suff- 
cient regularity. In the winter of 1876, therefore, I 
kept two nests under close observation, having arranged 
with my daughters and their governess, Miss Wendland 
(most conscientious observers), that one of us should 
look at them once an hour during the day. One of the 
nests contained about 200 individuals of F. fusca, the 
other was a nest of P. rufescens with the usual slaves, 
about 400 in number. The mistresses themselves 
never came out for food, leaving all this to the slaves. 
We began watching on November 1, but did net 
keep an hourly register till the 20th, after which date 
the results are given in the following tables (see 
Appendix). Table No. 1 relates to the nest of F. 
fusca, and the ants are denoted by numbers. The 
hours at which we omitted to record an observation are 
left blank ; when no ant was at the honey, the square is 
marked with an 0. An ant, marked in my register as 
No. 3, was at the time when we began observing acting 
as feeder to the community. 
The only cases in which other ants came to the honey 
were at 2 p.M.on November 22, when another ant came 
