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THE BOTANICAL MAGAZINE. 

[Wol. VEIT. September 20, 1894. : No. 91.] 





Notes on the Attraction-Spheres in the Pollen-Cells of Ginkgo biloba. 
By | 
Sakugoro Hirase. 
Since Léon Guignard’s discovery of attraction-spheres in plant-cells™, several workers, such as Biitschli™, 
Paul Schottlander™, E. de Wildeman"™), Strasburger®), Karsten, also observed these minute bodies in 
various plants. ; 
In the course of investigation of fertilization of Ginkgo biloba, I met with pretty large attraction-spheres 
in the pollen-cells of this plant. The following is a brief description of these bodies. 
The figure represents a stage of pollen-cell, about two weeks before fertilizing season and suspended in the so- 
called ‘ pollen-chamber” of the ovule. The pollen-cell is ellipticaland 84 /z by 100 x in size. The nucleus lying 



(1) Sur l’existence des ‘‘ sphéres attractives” dans les cellules végétales. (Compt.-rend. de 7 Acad. des Sc., 1891). 
(2) Ueb, d. sog. Centralkoper d. Zeile u. thre Bedeutung. (Verhandlgn. d. Naturh.-Med. Ver. 2. Heidelberg, N.¥. Bd. IV, Heft 5). 
(3) Beitriige z, Kenntniss d. Zellkerns u. d. Sexualzellen b, Kryptogamen. (Cohn’s Beitr. 2, Biol. d. Pflanz, Bd. V1, 1892). 
(4) Sur les spheres attractives dans quelques cellules végétales. {Bulletin de V Acad. royale de Belgique. VY. XXI, 1891.—Sur les sphires 
abtractives dans les cellules végétales. (Do., 1892). 
(5) Histol. Beitr. Heft TV, 1892. 
6) Ueb. Beziehgn. d. N nleolen z. d, Oentrosomen b. Psilotum triquetrum. (Ber. d. Deuts. Bot. Ges. Jahrg. XII, 1893). 



“Notes on the Attraction- “Spheres it in the Pollen-Uolls of Ginkgo biloba. 
