the more we study the senses of different animals, the more do we learn that the sense of hearing ranks high in the scale, and comes late in the history of the progress of life; and thus we find that various creatures, whose powers of touch and of smell and of vision are marvellous, seem to be almost, or entirely, deaf.
there are a few insects which can hear, but the greatest number, including flies, cannot hear at all. every imaginable kind of sound has been tried, and insects, with the exception of very few, take no notice whatever. lord avebury who made a study of insects felt that they might respond to sounds too high-pitched for human years, but he could not get them to take any notice.
the highest string of a violin has been scraped an inch away from bees engaged in pillaging flowers and they have taken no notice whatever. the senses of insects, including flies, are so wonderful, and in some respects so superior to our own, that it is immensely interesting to find that nearly all insects are perfectly deaf.