Mayhew 1952 Mallard E 14 Experimental Eggs from Gibson Game Farm, Route 2, Box 336, St. Helena, California. Candling (4/21/52) Condition when stopped Candling 4/7/52 Relative No. set Humidity (3/29/52) Fertile Double shell Infertile Develop Infertile Develop stopped 40% 16 8 7 1 8 1 6 65% 26 15 8 3 14 0 9 75% 12 11 0 0 10 0 2 85% 22 18 1 3 16 0 3 90% 27 14 11 2 12 5 8 3 vitelline circle, no embryo seen. 2 mm. 3 mm. 2 mm. 9 dead embryos (very small) 2 dead embryos (very small) hatched, 105 mm., 28.5 gms 3 dead embryo (very small) still alive when egg opened by mistake (4/22/52). 3 dead embryos (very small) 2 blood rings 50 mm; 4 gms. 74 :: 5 :: condition of broken eggs (see pages E15,16) % of fertile eggs eggs broken open 90 0 11 90 0 13 100 0 10 86 0 17 74 0 11 Relative No. Date Hatched Humidity Fertile % of fertile eggs that hatch 40% 0 - 0 65% 0 - 0 75% 0 - 0 85% 0 - 0 90% 0 - 0