60 EXTRACTS AND ABSTRACTS; 
smaller cell (when present) is not implicated 
e intine in the Zariz-type is very thin and not hygroscopic ; 
e usually give origin to two large 
obtuse excrescences, which almost always appear between the two 
ir-chamb 
intine, and the suspensory cells take no part in their formation, as is 
universal e case. The ‘tube germant proprement dit” is bounded 
by the innermost layer of the intine which pierces the other layers. 
ing germination of the grains of the Abies-type, in the 
free. The fovi 
of spherical cells, each of which had a nucleus with one or two 
nucleoli. 
Millardet with profound sagacity detected the rudiments of a male 
prothallus in the microspores of Jsoétes, the Coniferous homologue of 
which is undoubtedly the group of Suspensory cells. The third of 
a) 
these cells, which has been shown to be etimes free in the grain- 
» together with its derivatives, M. Tchistiakoff with great 
plausibility likens mother-cells of the of Lsoétes, 
kk in this way, the pollen of Conifers shows some freshly- 
i ed remarkable points of similarity with the male element of 
Isoétes, and we may add also of Selaginella. 
DEVELOPMENT OF THE FiLower i Cucurstracex AND PLUMBAGINE®, 
Beitrige sur Entwickelungs-geschichte der Blithe. Von Dr, Exysr 
Revctuer. (* Botanische Zeitung,” June and July, 1876.)—This 
paper contains an account of the development of the flower in Cucur- 
bitacee and Plumbaginee. With regard to the first Order, several views 
are advanced different from those ordinarily entertained ; thus the 
