Morphologie, etc. — Varietäten. — Physiologie. 
325 
of a sporophyte apogamously produced. Such sporophytes contain 
the x number of chromosomes throughout their life history. 
This adds to the evidence that the number of chromosomes is 
not the only factor which determines the character of the sporo¬ 
phyte and gametophyte. Charles J. Chamberlain (Chicago). 
Young, Mary S., The Male Gametophyte of Dacrydium. (Bota- 
nical Gazette. XLIV. 1907. p. 189—196. Plate 19.) 
Material of Dacrydium bi forme, D. Bidwillii, D. cupressinum, 
D. laxifolium and D. int er medium was collected by Prof. L. Cockayne 
in December 1906 and January 1907 in New Zealand. Of these, 
D. Bidwillii showed a complete series of stages from the uninucleate 
microspore to the shedding of the pollen; D. cupressinum and D. 
intermedium showed the pollen grains and young pollen tubes in 
the micropyle and nucellus. 
Two prothallial cells are cut off from the main body of the 
spore. In D. Bidwillii usually only the second one divides, while in 
D. laxifolium and D. cupressinum both divide. The generative cell 
might be mistaken for a third prothallial cell were it not for its 
further history. It divides anticlinally into a body cell and a sterile 
cell, but sometimes into two body cells. The walls of the prothallial 
cells and of the two daughter generative cells disappear, so that the 
mature pollen grain contains the body cell and five or six free 
nuclei, according as the first prothallial cell has or has not divided. 
The paper contains a discussion of the prothallial cell Situation 
in Gymnosperms. Charles J. Chamberlain (Chicago). 
Blaringhem, L., Variations dans le Coquelicot (. Papaver 
Rhoeas L.) (C. R. Acad. Sc. Paris. 16 Dec. 1907.) 
Le potymorphisme du Papaver Rhoeas est bien connu. Blarin¬ 
ghem a etudie une Station tres interessante ä ce point de vue qui 
subsiste isolement dans une region de grande culture oü eile occupe 
une superficie d’une dizaine d’ares. Cette Station comprend cette 
annee 250 individus tres differents parmi lesquels il est impossible 
de determiner une lignee dominante. On a pu distinguer 14 catego¬ 
ries. Or, Jordan, pour obtenir une quinzaine de formes differentes 
de P. dubium, a eu recours ä des localites tres distantes. II parait 
probable que la Station oü tant de types differents sont reunis est en 
voie de mutation. * Jean Friedei. 
Andre, G., S ur la constance de la composition des sucs 
vegetaux obtenus par des extractions successives. (C. R. 
Acad. Sc. Paris. 23 Dec. 1907.) 
Cette note est la suite de longues recherches sur le meme 
sujet, anterieurement communiquees ä l’Academie. Les experiences 
actuelles portent sur des feuilles de mache ( Valerianella olitoria ) et 
... T , , azote cendres 
sur des racmes de carotte. L examen des rapports --, -— 
extrait extrait 
montre que la composition des liquides est ä peu pres constante, 
quelle que soit la pression. 
Si l’on compare les chiffres, d’un epuisement ä l’autre, on 
trouve une constance remarquable de tous ces rapports. 
Jean Friedei. 
