Consider now another experiment, also in rats (Fig. 3). Two identical groups, twenty in each, from the above-mentioned stock were used in it. They were housed in colonies: both in large cages of the same dimensions. One group was fed on a diet similar to that used by the Sikhs; the other on a diet such as is commonly used by the poorer classes in England. The latter diet consisted of white bread, margarine, over-sweetened tea with a little milk (of which the rats consumed large quantities), boiled cabbage and boiled potato, tinned meat and tinned jam of the cheaper sorts. It has many faults, of which vitamin and mineral deficiencies are the chief. The first thing one noticed, as this experiment progressed, was that the members of the former, and well-fed, group lived happily together. They increased in weight and flourished. The other group did not increase in weight; their growth was stunted; they were badly proportioned; their coats were staring and lacking in gloss; they were nervous and apt to bite the attendants; they lived unhappily together and by the sixtieth day of the experiment they began to kill and eat the weaker ones amongst them.