Mayhew 1952 Experimental Mallard E 11 Eggs from Gibson Game Farm, Route 2, Box 336, St. Helena, California. Candling (3/8/52) Candling (3/21/52) Relative No. set Humidity (3/29/52) Fertile Doubtful Infertile Develop. Infertile Develop. Condition when stopped 40% 18 5 0 13 3 0 2 (see "condition of broken eggs") 65% — — — — — — — 75% — — — — — — — 85% 18 6 5 7 6 5 0 90% — — — — — — — Relative No. Date % of Fertile eggs that Hatch % of fertile eggs eggs broken open condition of broken eggs Humidity Hatched (4/1/52) 40% 0 — 0 14 5 very small embryo. 1 partly covered with down. 3 fully developed, but lots of yolk to be absorbed. 65% — — — — — 75% — — — — — 85% 0 — 0 16 6 fully developed, but some yolk to be absorbed. 90% — — — — —