4IO BOTANICAL GAZETTE [December 



21. In the formation of the megaspores the daughter cells 

 do not divide simultaneously, thus perhaps giving a clue to the 

 history of the abridgment of the process in some angiosperms. 



22. The female gametophyte develops normally. 



23. Double fertilization was observed in Asclepias Cornuti^ 

 one of the male cells fusing with the antipodal polar nucleus. 

 This throws doubt upon the view that the attraction is due to 

 near relation of the micropylar polar to the ^^g* 



24. Fertilization may occur before or after the fusion of the 

 polars. 



25. A few tracheids were found in the ovules near the antip- 

 odals. 



26. The fertilized ^gg rests until the endosperm has become 



sixteen-celled or more. It is surmised that some reported cases 

 of endosperm division before fertilization may be due to mis- 

 taking fertilized for unfertilized eggs. 



27. The pappus is composed of single-celled, uninucleate, 

 epidermal hairs. 



28. The double wall of the pod has its origin in the rupture 

 of the parenchymatous tissue within the wall of the carpel. 



LITERATURE CITED. 



1. Benson, Margaret, Contributions to the embryology of the Amenti- 



ferae. I. Trans, Linn. Soc. London II. Bot. 3 : 409-424, //5. ^7-7^. 



1894. 



2. Brongniart, a,, Quelques observations sur la maniere dont s'opere la 



f^condation dans les Ascl^piad^es. Ann. Sci, Nat. I. 24 : 263-279. 

 pis. 13-14. 1 83 1. 



3. Chauveaud, L. G., De la reproduction chez le Dompte-venin. Diss. 



Paris, igo2. 



4. CoRRY, T. H., On the mode of development of the pollinium in Ascle- 



pias Cornutu Trans. Linn. Soc. London 11. Bot. a : 75-84- P^- ^^• 

 1883. 



5- » On the structure and development of the gynostegium, and mode 



, of fertilization in Asclepias Cornuti. Trans. Linn. Soc. London II. Bot. 

 a : iTi-^Qj.pls. 24^26. 1884. 



6. Eichler, A., Bluthendiagramme, p. 252. Leipzig. 1875. 



7. Frye, T, C, Development of the poUea in some Asclepiadaceae. Bot. 



Gaz. 32 : 325-33 1 • /^- -^J. 1901. 



