236 BOTANICAL GAZETTE [ MA acH 



PLATE XVII 



Fig. 24. — Body cell with two blepharoplasts. X945. 

 Fig. 25. — Pollen tube structures after the transverse orientation of the 

 blepharoplasts. May 5, 1906. X237. 



Fig. 26.— Beginning of the spiral band. X 1890. 



Fig. 26a. — Topography of pollen tube structures at the stage shown in jig. 26. 



Fig. 27. — View of nucellus with pollen tubes at the stages shown in figs, 

 26-29. X8. 



Fig. 28.— Connection of the nucleus with the spiral band. X945. 

 Fig. 29. — Apex of a sperm, showing that the sperm is organized within * 

 mother cell: t, pollen tube; w, wall of sperm mother cell. X800. 

 Fig. 30.— Transverse section of spiral band. X945. 



PL A te x VIII 



Fig. 31.— Photomicrograph of pollen tube showing blepharoplast witlfgray 



bodies on the radiations. X800. 



Fig. 32— Photon: 

 mother cells. X800. 



FlG - 33— In text. 



sperms are formed within 



