212 conn’s ‘‘ BEITRAGE ZUR BIOLOGIE DER PFLANZEN.” 
attempt to decide, for statistics appear to afford no evidence on the 
point; unless, indeed, the following comparison sears Alpine 
plants with and those without a pappus or similar organ has some 
fruit is the more readily di reed by wind. It shows that 
amongst — plants the average of species bearing such fruit is 
8 per cent., whilst amongst other plants it is 19 per cent., below the 
average of as, with fruit not pappose. 
Alpine Spec Average. 
60 Fite 28 &e. . i s°..1°6S 
344 withou é ‘ Te 
-COHN’S “ BEITRAGE ZUR a DER PFLANZEN.” 
ES notice seriatim the rather lon ae tr ae of the 
two last parts (vol. ii., parts 1 and 2) of this pabiivet 
art 1 commences with Zelle und Zellk Be erkungen 2 
Strasburger’s Schrift ** Weber Zelibildung und Zalltheilung,” in which 
eopold Auerbach criticises some portions of Prof. Strasburger’s 
work recently noted in these pages. He holds that the nucleus is not an 
ageregation of protoplasm, but a sort of drop filled with fluid, which 
afterwards becomes surrounded by a membrane formed on the inner- 
most layer of the surrounding protoplasm ; the nucleolus is supposed to 
be formed by aggrégations of nucleolar substance inside the nucleus. 
He thinks that Strasburger, in the case of Phaseolus, has mistaken 
nucleolus for nucleus, and that what is in reality a cell is mistaken for 
the nucleus ; while in Ephedra the mistake has been committed of view- 
ing as a nucleus a circuit of protoplasm with a nucleus ori ng in 
its interior. The subject is one of extreme difficulty, but when the 
author tries to show that Lede oot 8 ig ai are incon nsistent, we 
must say that we cannot agree , is it necessary 
that the nucleus of both animal bh regitatiie cells should have the 
same minute structure ?* 
Anatomie der vegetativen Organe von Dionea museipula, 
Ell. Von Dr. A. Fraustadt. In this memoir caaee be found 
al e 
is p cnaiteated by the rapid growth of young leaves 
the old o i 
to orth fi the sade of nes e suggests that creatures like 
Woodlice yriapods may be most easily preyed upon by Dionea.t 
He finds plenty of starch in pidermal cells of those leaves which 
have not absorbed nitrogenous substances, but this is not the case where 
there has been absorption of nutriment. .{ Experiments were made 
por ig movement of the ‘amie ] se gape nent 
sa g lobes cc i be requisite for the capture 
_ ¥ With this — be compared the a of hee starch from the cor- 
tical cells in neighbourhood of the suckers of 
