STUDIES IN INCUBATION

Abstract
To simulate California field conditions, eggs were put into the refrigerator (28-32[degree]F.) at 5 p.m. each day and removed at 7 a.m. to a temp, of 60[degree]F. Refrigerating hatching eggs not over 3 days old for 1-3 successive nights of 14 hrs. each or for 3 nights plus 38 hrs. was not harmful; for 4 successive nights plus 38 hrs. was harmful. A long exposure at 32[degree] would probably be injurious, but the brief periods of low temperature to which hatching eggs are ordinarily exposed in California are not cold enough or long enough to injure.

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