IOWA ACADEMY OF SCIENCES. 
93 
Fig. e. 
Fig. f. 
Fig. g. 
Fig. h. 
Fig. i. 
Embryo sac of the Poole’s Pride, May 9. Showing the synergids, 
egg cell and definitive nucleus. 
Embryo sac from the second ovule of the same ovary as e. 
Normal, showing no signs of abortion. 
Wyant ovule showing the embryo sac, seed coats and nucellus. 
May 5. 
Embryo sac of the Poole’s Pride, May 14. 105 in length. 
Embryo sac of the Poole’s Pride, May 14. 
PLATE VIII. 
Fig. a. An abortive ovary of the Wyant Plum, May 5, all the tissues 
disorganized and dead with the exception of the embryo sac 
itself. 
Fig. b. Abortive ovule of the Wyant showing the nuclei still vigorous and 
apparently normal in the embryo sac. May 5. 
Fig. c. Ovary of the Wyant showing the two normal ovules previous to 
the abortion of one of them. 
Fig. d. Longitudinal section of the plum flower in December. 
Fig. e. Abortive ovule of the Wyant showing the normal embryo sac. 
This is an abortive ovule of a normal ovary. 
Fig. f-g. Longitudinal section of the pistils of the Wyant Plum. 
