insects to eat, and the insects carry their pollen away for them."

"Yes, that's something like it," said grandmamma. "And now you can see
why flowers which bloom at night need to have a strong odour. There are
some plants which

'Keep their odours to themselves all day'

but towards evening they

'Let the delicious secret out;'

and it is that moths and insects that fly about at night may know
whereabouts the flowers are. The bees are busy in the day-time; but
there are a great many kinds of moths, in fact there are more moths than
there are butterflies, and they only fly about at night, and the honey
of flowers is their sole food. So you see the scent of flowers has a
great use."

"I never thought of that before," said Mary.

"If the flowers which keep open late in the evening have not a very
strong perfume, they are generally white or pale yellow, so as to be
seen easily. There is one of these plants called the evening
primrose--not that it is like a primrose except in colour--at the bottom
of the garden walk."

"Do let us go and see if there is a moth on it, grandmamma."

Grandmamma smiled and said, "Jack might go and look, and then he could