The Tortoiseshell-and-white Cat.

This is a more common mixture of colouring than the tortoiseshell pure and simple without white, and seems to be widely spread over different parts of the world. It is the opinion of some that this colour and the pure tortoiseshell is the original domestic cat, and that the other varieties of marking and colours are but deviations produced by crossing with wild varieties. My brother, John Jenner Weir, F.L.S., F.Z.S., holds somewhat to this opinion; but, to me, it is rather difficult to arrive at this conclusion. In fact, I can scarcely realise the ground on which the theory is based at the same time, I do not mean to ignore it entirely. And yet, if this be so, from what starting-point was the original domestic cat derived, and by what means were the rich and varied markings obtained? I am fully aware that by selection cats with large patches of colour may be obtained; still, there remain the peculiar markings of the tortoiseshell. Nor is this by any means an uncommon colour, not only in this country, but in many others, and there also appears to be a peculiar fixedness of this, especially in the female, but why it is not so in the male I am at a loss to understand, the males almost invariably coming either red-tabby or red-tabby-and-white. One would suppose that black or white would be equally likely; but, as far as my observations take me, this is not so, though I have seen both pure white, yellow, red, and black in litters of kittens, but this might be different were the he parent tortoiseshell.

Fonte: Cats