As it grows dusk the bats flitter to and fro by the house; there are moths, then, abroad for them. Upon the cucumber frame in the sunshine perhaps there may be seen an ant or two, almost the first out of the nest; the frame is warm. There are flowers open, despite the cold wind and sunless sky; and as these are fertilised by insects, it follows that there must be more winged creatures about than we are conscious of. How strange it seems, on a bleak spring day, to see the beautiful pink blossom of the apricot or peach covering the grey wall with colour--snowflakes in the air at the time! Bright petals are so associated with bright sunshine that this seems backward and inexplicable, till it is remembered that the flower probably opens at the time nearest to that which in its own country brings forth the insects that frequent it. Now and again humble-bees go by with a burr; and it is curious to see the largest of them all, the big bombus, hanging to the little green gooseberry blossom. Hive-bees, too, are abroad with every stray gleam of sun; and perhaps now and then a drone-fly--last seen on the blossoms of the ivy in November. A yellow butterfly, a white one, afterwards a tortoiseshell--then a sudden pause, and no more butterflies for some time. The rain comes down, and the gay world is blotted out. The wind shifts to the south, and in a few days the first swallows are seen and welcomed, but, as the old proverb says, they do not make a summer. Nor do the long-drawn notes of the nightingale, nor even the jolly cuckoo, nor the tree pipit, no, nor even the soft coo of the turtle-dove and the smell of the May flower. It is too silent even now: there are the leading notes; but the undertone--the vibration of the organ--is but just beginning. It is the hum of insects and their ceaseless flitting that make the summer more than the birds or the sunshine. The coming of summer is commonly marked in the dates we note by the cuckoo and the swallow and the oak leaves; but till the butterfly and the bee--one with its colour, and one with its hum--fill out the fields, the picture is but an outline sketch. The insects are the details that make the groundwork of a summer day. Till the humble-bees are working at the clover it is too silent; so I think we may begin our almanack with the house-fly and the moth and the spider and the ant on the cucumber frame, and so on, till, finally, the catalogue culminates with the great yellow wasp. He is the final sign of summer; one swallow does not make it, one wasp does. He is a connoisseur of the good things of the earth, and comes not till their season.