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Tyzzer (1917), who described an epidemic that had appeared in his mouse colony, named the causative organism Bacillus piliformis, giving an inclusive description of its behaviour and morphology. Both natural and experimental infections were studied. The high susceptibility of the Japanese waltzers as contrasted with the relative immunity of the common mice suggests that the disease susceptibility may be linked with the waltzing factor.

OXF. FIGUREInformation 011 the rate of sperm travel and tlie time of ovulation are essential in the timing of natural and artificial insemination, particularly where only one service is allowed in the estrous period. Such data are also of value in providing a more thorough understanding of the reproductive processes. Some information is available on these points, but information is lacking on time of ovulation in certain breeds of sheep. Data 011 rate of sperm travel a r e not sufficiently complete to allow for definite conclusions, and there is considerable rariation in the findiiigs of different workers. MATERTAL AND METIIODS

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