It has, I think, now been shown that man and the higher animals, especially the Primates, have some few instincts in common. All have the same senses, intuitions, and sensations--similar passions, affections, and emotions, even the more complex ones, such as jealousy, suspicion, emulation, gratitude and magnanimity; they practise deceit and are revengeful; they are sometimes susceptible to ridicule, and even have a sense of humour; they feel wonder and curiosity; they possess the same faculties of imitation, attention, deliberation, choice, memory, imagination, the association of ideas, and reason, though in very different degrees. FOOTNOTES: [Footnote 57: From Chapter III of "The Descent of Man," 1871. All except three of the author's foot-notes have been omitted.] [Footnote 58: "The American Beaver and his Works," 1868.--Author's note.] [Footnote 59: All the following statements, given on the authority of these two naturalists, are taken from Rengger's "Naturgesch. der Säugethiere von Paraguay," 1830, s. 41-57, and from Brehm's "Thierleben," B.i. s. 10-87.--Author's note.] [Footnote 60: A critic, without any grounds ("Quarterly Review," July, 1871, p. 72), disputes the possibility of this act as described by Brehm, for the sake of discrediting my work. Therefore I tried, and found that I could readily seize with my own teeth the sharp little claws of a kitten nearly five weeks old.--Author's note.] THE IMPORTANCE OF DUST: A SOURCE OF BEAUTY AND ESSENTIAL TO LIFE[61] ALFRED RUSSEL WALLACE The majority of persons, if asked what were the uses of dust, would reply that they did not know it had any, but they were sure it was a great nuisance. It is true that dust, in our towns and in our houses, is often not only a nuisance but a serious source of disease: while in many countries it produces ophthalmia, often resulting in total blindness. Dust, however, as it is usually perceived by us, is, like dirt, only matter in the wrong place, and whatever injurious or disagreeable effects it produces are largely due to our own dealings with nature. So soon as we dispense with horsepower and adopt purely mechanical means of traction and conveyance, we can almost wholly abolish disease-bearing dust from our streets, and ultimately from all our highways; while another kind of dust, that caused by the imperfect combustion of coal, may be got rid of with equal facility so soon as we consider pure air, sunlight, and natural beauty to be of more importance to the population as a whole than are the prejudices or the vested interests of those who produce the smoke.