By noting the color of the food and that of the feces it was made certain that each bolus was digested and the waste ready for voiding before the bird could be stimulated to receive food again. The young bird, then, does not take food until. the previous bolus has been digested. Immediately upon swallowing a fresh supply a very complicated reflex is set up, which not only leads to defecation but places the young bird in an unusual position in which the parent bird can most easily ,collect the excreta as voided and remove it from the nest. (2665)Since the first pronouncement by hliller' in 1890 that tooth caries is the result of the acid fermentation of carbohydrates by bacteria, students of this subject have been searching for a specific organism of caries.Kligler2 first pointed out that in the lesions of caries B. acidophilus is commonly present, associated with L. buccalis, C. placoides, and B. putrificus. Later Howe and Hatch3 found in advanced lesions of caries the Moro-Tissier group of organisms associated with certain other types which they called respectively Bacillus X, PI, and Y. More recently MacIntosh, James and Lazarus-Barlow'? ' in England, and Rodriguez' in this country, by the use of acid media have found that in deep carious lesions 1

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