The (levelopment of tlie ovule, embryo-sac 

 and efiçff in Podostemaceae. 



BY ^EW YORK 



BOTaNJCaL 

 F. A. F. C. WENT. qaRDEN. 



With Plate I. 



During my voyage to the West-Indies I had an oppor- 

 tunity of visiting in Surinam some of the rapids where 

 Podostemaceae grow, namely the Armina falls of the Ma- 

 rowyne river. There I collected material of thèse remarls- 

 able plants, and at a later date I received an abimdant 

 supply obtained by the various expéditions, which oflate 

 years hâve investigated the interior of the colony. This 

 material, preserved in alcohol, has suggested to me an 

 investigation of the above order. I hope soon to publish 

 the results in extenso, but wish in this place to deal 

 briefly with one point, namely the development of the 

 ovule, the embryo-sac and the egg. 



As was mentioned above, the material was fixed in 

 alcohol, but the fixation nevertheless proved to be good 

 enough to allow of many cytological détails being made 

 out with a sufficient degree of certainty in stained pré- 

 parations. In this preliminary communication I do not 

 propose to discuss the method of treatment of the pré- 

 parations, but merely record, that Messrs. A. H. B 1 a a u w 

 and .J. Kuyper hâve assisted me. A complète developmen- 

 tal séries could only be obtained in the case of a few 

 Recueil des trav. bot. Néerl. Vol. V. 1908. 1 



