UNIVERSITY OF CALIFORNIA PUBLICATIONS 
IN 
ZOOLOGY 
Vol. 9, No. 3, pp. 105-136, pls. 13-17 February 23, 1912 
STUDIES ON. EARLY STAGES OF DEVELOPMENT 
IN RATS AND MICE. No. 3 
BY 
E. L. MARK AND J. A. LONG 
THE LIVING EGGS OF RATS AND MICE 
WITH A DESCRIPTION OF APPARATUS. FOR 
OBTAINING AND OBSERVING THEM 
(Preliminary Paper) 
BY 
J.-A. LONG 
UNIVERSITY OF CALIFORNIA PRESS 
BERKELEY 
