I have found among my papers the following mislaid note on the subject of sportive displays of mammalians, which should have been used on page 281, where the subject is briefly treated:--Most mammalians are comparatively silent and live on the ground, and not having the power to escape easily, which birds have, and being more persecuted by man, they do not often disport themselves unrestrainedly in his presence; it is difficult to watch any wild animal without the watcher's presence being known or suspected. Nevertheless, their displays are not so rare as we might imagine. I have more than once detected species, with which I was, or imagined myself to be, well acquainted, disporting themselves in a manner that took me completely by surprise. While out tinamou shooting one day in autumn, near my own home in La Plata, I spied a troop of about a dozen weasels racing madly about over a vizcacha village--the mound and group of pit-like burrows inhabited by a community of vizcachas. These weasels were of the large common species, Galictis barbara, about the size of a cat; and were engaged in a pastime resembling a complicated dance, and so absorbed were they on that occasion that they took no notice of me when I walked up to within nine or ten yards of them, and stood still to watch the performance. They were all swiftly racing about and leaping over the pits, always doubling quickly back when the limit of the mound was reached, and although apparently carried away with excitement, and crossing each other's tracks at all angles, and this so rapidly and with so many changes of direction that I became confused when trying to keep any one animal in view, they never collided nor even came near enough to touch one another. The whole performance resembled, on a greatly magnified scale and without its beautiful smoothness and lightning swiftness, the fantastic dance of small black water-beetles, frequently seen on the surface of a pool or stream, during which the insects glide about in a limited area with such celerity as to appear like black curving lines traced by flying invisible pens; and as the lines everywhere cross and intersect, they form an intricate pattern on the surface, After watching the weasel dance for some minutes, I stepped up to the mound, whereupon the animals became alarmed and rushed pell-mell into the burrows, but only to reappear in a few seconds, thrusting up their long ebony-black necks and flat grey-capped heads, snarling chattering at me, glaring with fierce, beady eyes. THE STRANGE INSTINCTS OF CATTLE. In November and December, 1893, a short correspondence appeared in the _Field_ on the curious subject of "Dogs burying their dead." It arose through a letter from a Mr. Gould, of Albany, Western Australia, relating the following incident:--