Nothing else is possible in the flower, and whether it is bombus or not that effects it, the method is sufficiently evident.
"My Studio Neighbors"
William Hamilton Gibson
But the more ample passage in acaule would suggest the medium-sized bombus as better adapted-as the experiment herewith pictured from my own experience many times would seem to verify, while a honey-bee introduced into the flower failed to fulfil the demonstration, emerging at the little doorway above without a sign of the cordial parting token.
"My Studio Neighbors"
William Hamilton Gibson
So much is bombus better than a man.
"Birds in the Bush"
Bradford Torrey