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The total gain in weight for the infusoria-free lot in 8 weeks was 156 lbs. as contrasted with 117 lbs. for the normal infected lot. Thus to date the infusoria-free lot has shown a weight increase of 133.3% as much as that of the other lot. The lambs were weighed individually and a table of individual weights each week in pounds and ounces will be published in a later paper. The experiment will continue at least until September first. The results of the experiment to date certainly indicate that, as measured by weight gains of growing animals, ruminants derive no benefit from the infusoria normally present in the first two divisions of their stomachs. We reserve our judgment as to whether or not these protozoa are a handicap until the experiment has progressed further. Acknowledgment.-The experiments reported in this note are being made possible by grants from the American Association for the Advancement of Science and from the BACHI FUND OF THs NATIONAL ACADZMY OF SCIENCES.

THE METHOD BY WHICH RUMINANTS ACQUIRE THEIR FAUNA OF INFUSORIA, AND REMARKS CONCERNING EXPERIMENTS ON THE HOST-SPECIFICITY OF THESE PROTOZOA