376 5. Entwicklungslehre. 



their possible relation to one another, and to forms described by other ob- 

 servers under the names Crithidia, Trypanosoma etc. Concludes that a 

 typical Leptomonas divides in the intestine or Malpighian tubes, giving rise 

 to active slender forms with undulating membrane, that these forms encyst in 

 the rectum, and probably pass out with the faeces giving rise to flagellate 

 forms in another fly. Whether the large biflagellate Herpetomonas also 

 found has a place in this life-history is doubtful. The various small uni- 

 flagellate forms found by other observers in non-bloodsucking flies and des- 

 cribed a Crithidia or Trypanosoma are thus probably stages in the life-cycle 

 of Leptomonas, but Herpetomonas is possibly distinct. 



Doncaster (Cambridge). 



1034) Buchanan, G., Note ou the Developmental forms of Trypano- 

 soma brucei in the internal organs, axillary glands and bone- 

 marrow of the Gerbillus pygargus. 



(Proc. Roy. Soc. B84,B570. p. 161—164. 1 plate. 1911.) 



Doncaster (Cambridge). 



1035) Arnaud, G., Contribution ä l'etude des fumagines. 



(Annales de l'Ecole Nationale d'Agriculture de Montpellier 10,3/4. p. 211—330. 1911.) 

 L'auteur, dans cette seconde partie de son travail, etudie la systematique 

 et l'organisation des especes, dont il decrit le developpement. 



C. L. Gatin (Paris). 



1036) Maire, R. et A. Tison, Sur quelques plasmodiophoracees non 

 hypertrophiantes. 



(Compt. Rend. Acad. des Sciences de Paris 152,4. p. 206—208. 1911.) 



Les auteurs ont decouvert, dans les racines de Veronica arvensis et 

 dans celles duCallitriche stagnalis, deux plasmodiophoracees non hyper- 

 trophiantes dont ils decrivent le developpement, caracterise par la reduction 

 extreme de la schizogonie et qu'ils rangent dans un groupe nouveau et dans 

 le genre nouveau Ligniera. C. L. Gatin (Paris). 



1037) Lloyd, F. E., Development and nutrition of the embryo, seed 

 and carpel in the date, Phoenix Dactylifera L. 



(Annual Rept. Mo. Botanical Garden 21. p. 103—164. pls. 15—18. 1910.) 

 The development of the embryo, seed and pericarp of the date have been 

 followed with special reference to their nutrition from the anatomical-physio- 

 logical point of view. The antipodal cells as well as certain tapetal cells were 

 found to be active in connection with the nutrition of the embryo sac. A series 

 of „digestive pockets" is forme around the antipodal end of the embryo sac. 

 For three months following pollination the growth of the embryo is very slow. 

 During this time growth of the ovular tissues takes place. During the next 

 period the embryo developes and reserve cellulose is laid down as a thickening 

 of the walls of the endosperm cells. Starch plays only a brief role during the 

 early development of the embryo. 



The distribution of the tannins was studied with special reference to the 

 part they play in nutrition. Aplastic tannin was found in the hypodermis 

 and in idioplasts where it becomes insoluble and therefore tasteless. Plastic 

 tannin, which is concerned in the nutrition of the embryo sac, accumulates 

 in the chalazal region of the embryo sac and appears to be given over to 

 the growing endosperm, whicb contains it in large amounts until after the 

 reserve cellulose is formed. Tannin also appears in the embryo throughout 

 its development and oil appears in the endosperm some time before the re- 

 serve cellulose is formed. Gates (St. Louis). 



