NOTICES OF BOOKS. 155 
the form of aggregations as ‘shown in the last figure, penetrating into the 
endosperm and already becoming divided. x 100, 
—Longitudinal ene 8 of an ‘‘egg” of Picea vulgaris, showin 
dissolving nucleus with radiate disposition of the surrounding protoplasm. 
ei ig. 5 —The same “‘apical”’ nuclei in course of division: on the left the 
‘‘nuclens-band ” is still entire. x 250. 
ig. e same. Sone completely divided, and a cellulose wall secreted 
on the ‘ cell- band,” x 250 
eee ge Different phases of the nucleus = Spirogyra Pie sabe 
7, just before commencement of division ; 8, nucleus quadrilateral with well- 
defined “ nucleus-band”; 9, nucle us-band separa and nucleus een ngated 
parallel to the longitudinal axis of the cell ; at each pole of the mother-nucleus 
is seen a oe of protoplasm. 
ig. 10.—Spirogyra orthospira, Mother-nucleus become seg ig ing only 
a few exterior threads uniting the young nuclei persisting ; the r have 
assumed a lenticular figure, and border each its polar preter oF proto- 
—The barrel-shaped mother-nucleus has entered into communica- 
tion in ¢ he y Pp lining the chlorophyll-band, the latter having 
raised (but not yet sundered) by the growing septu e newly-form 
nuclei are now practic independent, and the rest oft the septum is quickly 
formed. All the figures of Spirogyra her 00 tim 
ig. 12.—Portion of zoospore of Vaucheria sessilis, peewee m by osmic acid, 
showing the protoplasmic investing layer (Hautschicht), with transverse 
rods continuous with t. ili rods are bounded at each side by the 
fine plasma-layer. 
a 13.—Plasmodial branch of Paci septicum, in process of bev 
wn in; here the thicker portions e ** Hautschicht ” remain jbehind in 
the form of cilia: like petieaiationd. be ioe: a he 
e On THE Geveric eae BETWEEN Mosszs, VascuLag 
Cz , AND PHANEROGAMS. 
Ueber = genetischen sists der Moose mit den Gefasskrypto- 
gamen und Phanerogamen. Vou Dr. F. Krentrz-Gertorr. 
a Dokeniehs Zeitung,” Nov., 1876.) 
In Riccia, Marchantia, Preissia, the hitherto-examined Ferns, the 
prcramternb td and probably also the Hquisetacee, the first septum 
n the oosphere is inclined to the axis of the archegonium ; 
whilst it is Pieipendionlat to that axis in Spherocarpus, the Junger- 
mannia, Lycopodiacee, and Phanerogamia. As a rule, the members of 
the first set grow by a terminal cell, which in those of the second set 
Rhizocarpee. Moreover, the development of the seta in =e se 
answers closely to that of the suspensor of Selaginella and P, 
gamia, but takes place in a precisely opposite direction. We obtaits 
a co ries 
asuspensor below w 
It i gee therefore that the embryo has suffered a —— revolu- 
il g out these analogies, however, does 
not wish to lay much phylogenetic stress upon them; he is is far from. 
