Before the investigations which led up to these modern advanced views had been undertaken, it was very generally believed, on account of its self-coloured tawny coat, that the American puma--locally known as the American lion--was one of the nearest relatives of _Felis leo_. If, however, beauty be but skin deep, colour is an even less deeply seated feature among animals; and, as the result of the study of the markings of young cubs of the puma, it seems certain that this species has acquired its uniform tawny livery quite independently of the lion. For newly born puma cubs exhibit a pattern of quadrangular blackish markings totally different in form and arrangement from those of young lions, tigers, leopards, or jaguars, and approximating in some degree to those of the smaller cats. Accordingly, in the opinion of the investigator to whom we are indebted for these very interesting views with regard to the inter-relationships of the various members of the feline tribe, it seems highly probable that the puma may be an overgrown self-coloured representative of the group of smaller cats typified by the ordinary domesticated species and its wild relatives. A remarkable feature connected with the tuft at the tip of the tail of the lion is the frequent presence of a horny spur or claw, the function of which is still unknown, although it is certain that it is not employed, as was once thought to be the case, to goad the animal into fury when the tail is lashed against the flanks. It has been asserted that this spur is found only in the Indian lion; but this is as erroneous as the statement made by the same writer that it represents the last joint of the vertebræ of the tail to which the blood is unable to obtain access. A very similar structure exists in one member of the kangaroo tribe, known as the spur-tailed wallaby, in which, however, the spur is common to both sexes and quite constant in its development. Menagerie lions, it may be mentioned, generally display a greater luxuriance and profusion of mane than their wild relatives; while it is in the former alone that any marked development of long hair on the under surface of the body is noticeable. The reason for this is, of course, too obvious to require explanation, more especially when it is borne in mind that lions inhabiting open plains with grass-jungle have larger manes than those which have to get their living in a country overgrown with thorn-bushes. THE MANCHURIAN TIGER (_Felis tigris mongolica_) The tiger is, and apparently always has been, an essentially Asiatic animal, although it enters south-eastern Europe in the Caucasus, whence its range extends eastwards through Persia, Afghanistan, and India, to Java and Sumatra, while northward it is found through China and Mongolia to Korea and Amurland. Very noteworthy is its absence from Ceylon, which seems to indicate that its original home was central Asia, and that it is a comparatively recent immigrant into southern Asia.