52 C. K. Schneider: Morphologie und Systematik der Siphonogainen. [52 



any more than there will ever be complete agreement as to the limitations 

 of genera. It is futile in sciences to attempt to lay down principles 

 which interfere with individual judgments. For special purpose the 

 races may be designated numerically, as, Quercus alba, race 2: OenotJiera 

 biennis, race 12: Bursa pastoris, race 17: Draba verna, race 104; There 

 are doubtless many instances where the species is composed of only one 

 race, just as we have monotypic genera composed of but one species. 



3. Similar races constitute a species, the species designated binomially. 



4. Similar species constitute a genus, the genus designated monomially. 



261. Brittoii, Nathaniel Lord. Studies in West Indian plants, II. 

 (Bull. Torr. Bot. Club, XXXV, 1908, p. 561—569.) N. A. 



Betrifft: 7. Harrisia, a new genus of Cactaceae. — 8. Potomorphe peltata 

 Miq. (Piper peltatum L.). — 9. The genus Stegnosperma Benth. — 10. Unde- 

 scribed Species from Jamaica (Dorstenia, Trichila). — 11. Additions to the list 

 of Jamaica sedges. 



262. Britton, N. L. Studies of West Indian plants. (Bull. Torr. 

 Bot. Ol., XXXV, 1908, p. 337—345.) N. A. 



Betrifft: 



1. The Jamaican species of Hcrnandia- 



2. The genus Cassipourea in Jamaica. 



3. The genus Terebinthus P. Br. in the West Indies. 



4. Passiflora ciliata Ait. 



5. Bidens pilosa L. 



6. The genus Malache B. Vogel. 



263. Clements, Frederic E. An ecological view of species question. 

 (Americ. Naturalist, XLII, 1908, p. 253—264.) 



Verf. schliesst seine Betrachtungen mit folgenden bezeichnenden Worten: 

 In concluding, the ecologist will confess frankly that he does not know 

 what a species is. On the other hand, he is certain that he knows some of 

 the things it is not, and that the species of the deseriptive botanist comprise 

 several widely different things. Just what these are and what their relation 

 to species, if there are such, is a matter to be decided by experiment alone. 

 The question of what a species is can not even be answered provisionallv 

 untill a sufficientiy large number of experiments have been made to indicate 

 the regulär procedure in the origin of plant forms and to reveal the principles 

 that control it. 



264. Cook , 0. F. Origin and Evolution of Angiospermae throughApo- 

 spory. (Proc. Washingt. Acad. Sei., IX, 1907, p. 159—178.) 



Nicht gesehen. 



265. Costantin, J. et Poisson, II. Sur le Tsitsirj- de Madagascar. 

 (Assoc. franc. l'avancem. Sei., XXXVI, 1 part., Reims 1907, p. 230—231.) 



266. Costantin, J. et Poisson, H. Sur le „Tsitsiry" de Madagascar 

 (Assoc. franc. l'avancem. Sei., XXXVI, 2, Reims 1907, p. 433—440.) 



Nicht gesehen. 



268. Cowles, H. C. An ecological aspect of the coneeption of 

 species. (Americ. Naturalist, XLII, 1908. p. 265—271.) 



Verf. kennzeichnet seine Stellungnahme durch folgende Schlussworte: 



Taxonomy must be scientific. It rnust require fore its devotees a 

 training as rigid as that required by professional workers in morphology, 

 physiology or ecology. Species-making by taxonomic tyros must be abandoned 



