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described by Braun (1997) for right displacement of the abomasum and by Braun and others (1995) for small intestinal ileus. In cows with a right displacement of the abomasum, the liver is displaced by the abomasum from the right abdominal wall. Ultrasonographically, the abomasum is visible between the abdominal wall and the liver (Braun 1997). In the ventral region, the abomasum contains fluid ingesta and appears hypoechogenic. In the dorsal region, there is accumulation of gas to a varying degree, which causes reverberation artefacts, as described for cows with a left displacement of the abomasum (Braun 1997). In small intestinal ileus, the intestinal loops are dilated and have a diameter greater than 3*5 cm (Braun and others 1995). Their contents vary from hypoechogenic to echogenic, depending on their composition. Small amounts of fluid are commonly visible between the small intestinal loops. The ultrasonographic diagnoses were correct in all of the 30 cows with caecal dilatation, as judged by the surgical diagnoses. This result underlines the diagnostic value of ultrasonography for this condition, even if in 12 of the cases the diagnoses were not complete with respect to the direction of the retroflexed or twisted apex of the caecum. The most likely explanation for the disagreements between the diagnoses is that while the cows were walking the 100 m from the examination room to the surgery, the position of the caecum may have changed.

In Science for November 24, 1911, Osborne and Mendel reviewed briefly their experience in feeding isolated food substances to albino rats.2 The results of these experiments are so important and far reaching that it seemed desirable to repeat some of the work on another species. Albino mice were chosen because they are omnivorous, nearly as easy to handle as rats, apparently less susceptible to lung diseases, cost less to feed, being only about one-tenth as heavy as rats of corresponding age, and have an even shorter life span. Miss A. E. C. Lathrop of Granby, Massachusetts, who has had a long experience in breeding mice, says that the average life of a white mouse is a little less than two years. They are sexually mature at two months and fully grown at 150 days or less.With the exception of experiments of Rohmann,S details of which have not yet been published, mice have not been kept alive much longer than a month on food containing a single protein; Lunin4 fed casein as the only protein, as did Hall5 also; the latter 1 This investigation was made possible through the assistance of Drs. Thomas B. Osborne and Lafayette B. Mendel in connection with the Carnegie Institution of Washington. The helpful co-operation of Miss Edna L. Ferry merits special acknowledgement here.