One can see that a tube a trifle wider and a mother slightly smaller would account for this difference in the results.

Nevertheless, as the necessary space for a female is barely provided in this case, we see that the mother avoids as far as she can a two-sex arrangement beginning with males and that she adopts it only in the last extremity.

Finally, whatever the contents of the small tube may be, those of the large one, following upon it, never vary and consist of females at the back and males in front.
Though incomplete, because of circumstances very difficult to control, the result of the experiment is none the less very remarkable.
Twenty-five apparatus contain only males in their narrow gallery, in numbers varying from a minimum of one to a maximum of five.

After these comes the colony of the large gallery, beginning with females and ending with males.

And the layings in these apparatus do not always belong to late summer or even to the intermediate period: a few small tubes contain the earliest eggs of the entire swarm.