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The relative width between the outer surfaces zygomaticus arcs extremelysmall; the narrowness of the temporal fossae is also striking; the arc is very thin;the temporal muscles have left no trace either in the line of their attachment,neither they cover the surface; even the location of attachment of chewing musclesvery poorly developed. In the Museum of natural history, among skulls of dogs there isone, devoid of the name that catches the eye with its small size andtheir teeth: it belongs to one kind of lapdogs andhas features same with the features described above of the skull. Thiswe are dealing with two, if not three, groups of dogs, whichbeing equally protected and provided with food, representproof that in several generations the parts involved in the closingjaws, suffered a reduction. What should be attribute this decrease? Itselfgoes without saying, not artificial selection, as mostthe above features do not leave any traces on the exterioranimal; only the magnitude of the clearance zygomaticus arc one can benoticeable. The less can be talking about natural selection; because, on the onehand, could not be any struggle for existence between suchdogs; on the other hand, there can be no question about the profitability in the struggle forthe existence of such individual variations, which consist inreduction. Saving power also be excluded. With abundantfeeding, which was used by these dogs, much more could havea tendency to seek in the body places where it would be possible to postponesurplus food than to find such parts, which could be somethingto cut. Exactly the same may not be admitted speculation about a possible connectionbetween the above reduction, on the one hand, and shortening of the muzzle,caused, in all probability, the selection, on the other, as the bulldogswhich have a relatively short face, parts, taking part inthe closing of the jaws, are still extremely strong.
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