the air by symbiotic fixation. A minor experiment was added to determine the effect of quantities of organic matter on the location of nodules. In working on these problems it was found possible to obtain information of other points of interest...

A review of the literature reporting digestion experiments shows that but few investigators have studied the problem of digestion from the point of view of the influence of the condition of the animal on its ability to assimilate food. This thesis...

The purpose of the digestion trials, to be discussed in this paper, was to determine the effect of various factors on the ability of the animal to digest its food. The object of these experiments is somewhat different from the great majority...