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CARNEGIE INSTITUTION OF WASHINGTON, PUBLICATION No. 142 CONTRIBUTIONS FROM ZOOLOGICAL LABORATORY OF THE MUSEUM OF COMPARATIVE ZOOLOGY AT HARVARD COLLEGE. E. L. MARK, DIRECTOR. No. 216. Copies of this Book were first issued APR 3 191J PRESS OF J. B. LIPPINCOTT COMPANY PHILADELPHIA 41 First polar cell 41 Second polar cell 44 VIII. Criticisms and conclusions 45 A. Material 45 B. Methods 45 C. Time relations 46 D. Ovulation Chromatin Achromatin Centrosomes, circumpolar bodies, and clear region Position and orientation Division of first spindle and abstriction of first polar cell 3. Second spindle Chromatin Achromatin Centrosomes, circumpolar bodies, and clear region Position and orientation Division of second spindle and abstriction of second polar cell 4. Polar cells 5. Reduction IX. Summary of the principal results in the study of the egg of the mouse. ... Bibliography Explanation of plates .,-. THE MATURATION OF THE EGG OF THE MOUSE.

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