348 BOTANICAL GAZETTE 



NOVEMBER 



Fig. 23. — A later stage in fertilization. X3000. 



Fig. 24. — Fusing nuclei with cytoplasmic sheath. X1850. 



Fig. 25. — Second division of proembryo. X3000. 



Fig. 26. — Four-nucleate stage of proembryo; the other four nuclei degenerat- 

 ing. X3000. 



Fig. 27. — Section through thick integument showing inner fleshy layer, the 

 row of heavy-walled cells (containing crystals) which becomes the stony layer, 

 and the outer fleshy layer of two rows of cells. X1850. 



PLATE XXII 



Fig. 28.— Basal end of egg, showing egg nucleus, pollen tube with two male 

 nuclei and one other nucleus, and food vacuoles. X1850. 



Fig. 28&— The archegonium ol fig. 28, showing position of egg nucleus and 

 pollen tube in the egg. Xioo. 



Fig. 29.— Basal end of embryo sac, showing four nuclei of the proembryo, 

 remains of the pollen tube, and the non-functional male cell. X1850. 



Fig. 296. — Same as fig. 29, showing whole length of embryo sac. Xioo. 



Fig. 30.— Eight free nuclei of proembryo in basal end of sac, with pollen tube 

 above containing normal contents. X1850. 



Fig. 306.— Same as fig. 30, showing top of embryo sac. Xioo. 



Fig. 31. — Female gametophyte, showing disintegration by pollen tube; the 

 pollen tube is entering the egg from the side. Xioo. 



Fig. 31&. — Same a.s fig. 31. X1850. 



Fig. 32.— This figure shows the straight path usually made by the pollen 

 tubes through the nucellus to the archegonia. Xioo. 



Fig. 32b.— Same as fig. 32, showing the two probable neck cells; the loose 

 structure of the chromatin of the egg nucleus intimates that it may form a ventral 

 nucleus; body cell not yet divided. X1850. 



jr IG 33, — Long suspensor, with embryo buried deep in the female game- 

 tophyte. Xioo. 



