178 Botanisches Centralblatt. 



Blodgett, F. H. 1909. The stem offshoot in Erythronium propul- 



lans, Gray. (Johns Hopkins Univ. Circ. N. S. W. 6. p. 36—38. 1 pl.) 

 Bonnevie, Kr. 1909. Chromosomstudien. IL (Arch. f. Zellforsch. 



IL p. 201-278. 7 Taf.) 

 Brown, W. H. 1909. Nuclear phenomena in Pyronema confluens. 



(Johns Hopkins Univ. Circ. N. S. M 6. p. 42—45. 3 figs.) 

 Campbell, D. H. 1909. The embryosac of Pandanus. (Bull. Torrey 



bot. Club. XXXVL p. 205—220. 2 pl.) 

 Darling, Ch. A. 1909. Sex in dioecious plants. (Bull. Torrey bot. 



Club. XXXVL p. 177—199. 3 pl.) 

 Davis, B. M. 1909. Polar Organization of plant cells. (Amer. Nat. 



XLII. p. 501-504.) 

 Della Valle, P. 1909. L'organizzazione della cromatina studiata 



mediante il numero dei cromosomi. (Arch. zool. IV. 1. p. 1 — 177. 



1 tav.) 

 Ernst, A. 1909. Apogamie bei Burmannia coelestis Don. (Ber. 



deutsch, bot. Ges. XXVII. 4. p. 157-168. 1 Taf.) 

 Ernst, A. und Ed. Schmid. 1909. Embryosackentwicklung und 



Befruchtung bei Rafiflesia Patma Bl. (Ber. deutsch, bot. Ges. 



XXVIL 4. p. 176-186. 1 Taf.) 

 Friedel, J. 1909. Remarques sur le developpement du pistil chez 



les Malvacees. (Ass. fran?. Avanc. Sc. XXVIL 1908[^09]. p. 528— 530.) 

 Gatin, C. L. 1909. Polyspermie et polyembrvonie chez les palmiers. 



(Ass. fran?. Avanc. Sc. XXXVIL 1908['09]. p. 548—550.) 

 Geerts, J. M. 1909. Beiträge zur Kenntnis der Cytologie und der 



partiellen Sterilität von Oenothera Lamarckiana. (Rec. Trav. bot. 



neerland. V. 2/4. p. 93—206. 18 Taf.) 



V. Varietäten, Descendenz, Hybriden. 

 Cf. V. Aigret. 



Burt-Davy, J. 1909. Botanical characters of the maize plant. 



(Transvaal Agric. Journ. VII. 27. p. 348—395. ill.) 

 Burt-Davy, J. 1909. Mendelism in maize. (Transvaal Agric. Journ. 



VIL 27. p. 461—462. 1 pl.) 

 Cox, C. F. 1909. Charles Darwin and the mutation theory. 



(Amer. Nat. XLIII. p. 65—91.) 

 Darbishire, A. D. 1909. Recent advances in the study of heredity, 



(N. Phytologist. VIII. 5/6. p. 157-180.) 

 Darwin, Ch. 1909. The foundations of the origin of species, a 



Sketch written in 1842. Edited by his son Francis Darwin. 



(Cambridge, Univ. Press. 1909. 8«. XXII, 53 pp. 1 portr. 1 pl.) 

 Darwin, Ch. 1909. The foundations of the origin of species, two 



essays written in 1842 and 1844. Edited by his son Francis 



Darwin. (Cambridge, Univ. Press. 1909. 8^. XXIX, 263 pp. 1 portr.) 

 Doinet. 1907/8. Hybride d'un lis et d'une orchidee. (Actes Soc. 



Linn. Bordeaux. LXIL p. 54.) 

 Thomson, J. A. 1909. Heredity. "(New York, Putnam. 1908. 8°. 



XVI, 605 pp. 49 Fig.) 



Tl. Physiologie. 

 Cf. IV. Arbaumont. 



Abbott, G. 1909. The colours of leaves. (Nature. LXXX. 2067. p. 429.) 

 Aigret, C. 1909. Note sur la conservation multiseculaire de la pro- 



priete germinative des graines de certaines plantes annuelles. 



(Bull. Soc. roy. Bot. Belgique. XLVI. 3. p. 295—299.) 

 Andre, G. 1909. Sur l'elaboration de la matiere azotee dans les 



