160 BOTANICAL GAZETTE [AUGUST 
12. Hutcurnson, A. H., Fertilization in Abies balsamea. Bort. Gaz. 60:457- 
473- 1015. 
13. Mortrer, D. M., Uber das Verhalten der Kerne bei der Entwickelung des 
Embryosackes und die Verginge bei der Befruchtung. Jahrb. Wiss. Bot. 
31:125-158. 1898. 
, Fecundation in plants. Carnegie Inst. Publ. 15 
15. NAWASCHIN, S., Neuen Beobachtungen iiber elcehiias a "Pritillaria 
tenella und Lilium Martagon. Bot. Centralbl. 77:62. 1899. 
16. SAX, Kart, a arias in Fritillaria pudica. Bull. Torr. Bot. Club 
43 2505-523. 
‘ Pa cee "rE, Einige Bemerkungen zur Frage nach der déppelten 
Befruchtung bei den Angiosperms. Bot. Zeit. 58: 293-316. 1900. 
, Uber Befruchtung. Bot. Zeit. 59:1-8. 1901 
~ 
~J 
18. 
EXPLANATION OF PLATES III-V 
All figures were drawn with the aid of an Abbe camera lucida, with Bausch 
& Lomb 1.9 mm. oil immersion, and ocular 6. The magnification of all 
figures except fig. 29 is X1500; fig. 29 X420. The plates are reduced to two- 
thirds their original size. 
PLATE Ill 
Fic. 1.—Early union of egg and sperm in Lilium M. ee 
Fic. 2.—A little later stage in Trillium grandifloru 
Fic. 3.—Early prophase, separating membranes eae egg and sperm 
having disappeare 
Fic. 4.—A little later, but separating membranes still present. 
ie. 5.—An interrupted spirem in fertilized egg, spirem being more or less 
’ beaded. 
Fic. 6.—Early spirem in fertilized egg. 
Fics. 7, 8.—Development of spirem. 
Fics. 9, 10.—Two spirems in each nucleus, line a—b separating chromatin 
contributed by egg and sperm respectively. 
Fic. 11.—Contraction at time of segmentat 
G 12.—Later, contraction still evident; ether in two groups, 
nuclear ‘easter having disappeared. 
PLATE IV 
Fic. 13.—Formation of bipolar spindle, second group being pulled into 
equatorial plate. 
1G. 14.—Late telophase of first division. 
Fic. 15.—Two-celled embryo. 
Fic. 16.—Trillium grandiflorum; early coming together of three nuclei to 
form primary endosperm nucleus. 
