Mayhew 1952 Experimental Mallard E #41 June 12 M[14][3]+[6] at 65% were dropped & cracked, but left in the incubator. [3] was already pipped. June 13 1 F[17] egg at 65% was spoiled, so it was broken open. There was a very small embryo inside. An M[17] egg at 80% was also nothing, so it was opened & reveal an embryo about ½ grown. This morning 3 F[17] eggs at 65% were hatched, as was 1 M[17][2] egg at 40%. June 14 One more F[17] egg at 65% hatched today. June 17 One F[24] egg at 40% pipped today. June 18 Today the only other F[24] egg at 40% pipped. Also 2 M[23] eggs at 65% pipped, as well as 1 G[24] egg at 65%. June 19 This morning 2 F[24] eggs at 40% hatched, as did 1 G[24] egg at 65% + 1 M[23] egg at 65%. The results of breaking open all remaining bad eggs was as follows: 40% — G[24] — infertile 65% — M[17][1] — large embryo - lots of yolk " [2] — very small embryo " [3] — pipped too soon " [4] — large embryo - lots of yolk " [6] — pipped too soon " [8] — large embryo - lots of yolk " [10] — large embryo - lots of yolk " [11] — very small embryo 90% — M[17] — embryo about 1 week old 3 G[24] — very small embryos