Mayhew 1952 Mallard E 29 Experimental Eggs from Zack Farmer, 647 G. St., Davis, California. candling candling (4/21/52) Relative No.set Humidity(4/8/52) Fertile Doubtful Infertile Develop. Infertile Develop. stopped condition when stopped 40% — — — — — — — — 65% 7 5 1 5 0 1 15 mm. 75% 7 5 0 2 4 0 4/23/52-shell had piece knocked out, but embryo was still alive next day when egg was opened. 85% — — — — — — 90% — — — — — — Relative No. Date condition of broken eggs Humidity Hatched Hatched % of fertile eggs that hatch % of fertile eggs eggs broken open 40% — — — — — — 65% 1 4/29 20 71 — 75% 2 5/4 80 71 — 85% 1 5/5 — — — 90% — — — — —