To these crystal galleries, which might well inspire a certain distrust, were to be added more natural retreats: reeds of every length and thickness and disused Chalicodoma-nests taken from among the biggest and the smallest.

A scheme like this sounds mad.
I admit it, while mentioning that perhaps none ever succeeded so well with me.

We shall see as much presently.
My method is extremely simple.

All I ask is that the birth of my insects, that is to say, their first seeing the light, their emerging from the cocoon, should take place on the spot where I propose to make them settle.

Here there must be retreats of no matter what nature, but of a shape similar to that in which the Osmia delights.