(1) In your work on Bees, you state that you have seen stray workers inhabiting the nest of a distinct species.² Have you ever seen a stray fertile female Bombus inhabiting the nest of other species?³

(2) In Ants, which do not make slaves, have you ever seen stray workers of one species inhabiting the nest of another species?⁴

(3) Do you believe that Formica sanguinea always & invariably makes slaves; or is it only an occasional yet frequent instinct?⁵

(4) In relation to the habit of F. nigra & cunicularia, when acting as slaves to to F. rufescens, of feeding their masters, do you know whether F. nigra & cunicularia actually feed their own Queens or males in their own nests? or do the Queens & males of these species feed themselves on food brought by the workers?⁶