Enough for us to know that she dislikes narrow and long tubes, not because they are narrow, but because they are at the same time long.
And, in fact, she does very well with a short tube of the same diameter.

Such are the cells in the old nests of the Mason-bee of the Shrubs and the empty shells of the Garden Snail.

With the short tube the two disadvantages of the long tube are avoided.

She has very little of that crawling backwards to do when she has a Snail-shell for the home of her eggs and scarcely any when the home is the cell of the Mason-bee.

Moreover, as the stack of cocoons numbers two or three at most, the deliverance will be exempt from the difficulties attached to a long series.