314 Scientific Intelligence. 
sunlight by the development of a better palisade system. 
critical point of the investigation is plainly that leaves develop- 
these two: syster ms are welestasie found as stated in the thesis, the 
author asks whether this ought not to influence our treat tment of 
plants in green-houses. The paper and its illustrations are of 
a interest. ee 
os Rabenhorst’s Kry a-Flora, vol. Il, part pac 
have already noticed in thie ae ournal en earlier Saisie of the 
Sies, volume of this work, and now the first three parts of the 
second have just appeared containing the first part of the Marine 
Alge by Hauck. The marine flora of Germany proper is, of 
course, of comparatively small account, being confined princi 
pally to species from Heligoland and the Baltic; but the Austrian 
Species are numerous and interesting, and Hau ck, who resides at 
on the spot. After a sed — devoted to a Sen le of the 
issue 
bisiude the Porph riiack mariacee, LHildenbrandtiacee, 
ngt 
ieadtnts from previous classifications is mo arked in the 
ros tape in which are — Chyfoctatia eer Oa 
taken. Another innovation is the union of ep ae with 
Ceramium, which also seems warrant 
The descriptions and synonymy are excellently managed a! 
Hauck, and are accompanied by an astonishing number of g0° 
wood-cuts, principally after Thuret and Bornet and Ba 
iro 
are given ere are bisa thres “ene ‘photorithogaph 
of Corallinew. Altogether the work promises to be e 
to furnish what has long been a desideratum, viz: a ae ete 
guide to the marine Algw o the Germanic nations. To American 
students it will be especially welcome, as the ene illustra- 
tions and excellent descriptions are furnished at a pri within 
the reach of those who cannot afford to buy the larger ilstratel 
works. 
12, Heterceeism of the Sates by Cuartus B. PLow be 
In two very interesting and important papers published in s Grevil 
lea and the Gardeners’ Chrontele, ‘for 1882, Mr. Plowright on 
