| 1866. | Botany and Vegetable Physiology. 399 
I.—Forms of Nervation, with a single Primary Nerve. 
1. Nervatio Camptodroma. Bowed or inflected nervation. a. 
Dictyodroma—netted ; ex. Willow. 6. Brochidodroma— 
looped; ex. Circeea. ¢. Vere—True; ex. Rhamnus. 
2. Nervatio Craspedodroma. Marginate nervation. «a. Sim- * 
plices—simple; ex. Fagus, Castanea. 0b. Compositaa— 
compound ; ex. Polemonium ceruleum. 
3. Nervatio Hyphodroma. Concealed nervation ; ex. Coniferz. 
II.—Forms of Nervation, with several Primary Nerves. 
4. Nervatio Parallelodroma. Parallel nervation ; ex. Grasses. 
5. Nervatio Campylodroma. Curved nervation ; ex. Musacez. 
6. Nervatio Acrodroma. Convergent nervation. a. Perfecta ; 
ex. Conyallaria. 6. Imperfecta; ex. Arnica. 
7. Nervatio Actinidroma. Jadiated nervation. a. Reteformis 
—netted; ex. Nepeta. 0b. Imperfecta—imperfect; ex. 
Urtice. ¢. Marginales—marginated ; ex. Acer. 
March 8.—The Botanical Society of Edinburgh were pre- 
sented by Dr. Carrmgton with specimens of Scapania Bartlingit, 
Nees, a species of Hepaticaee new to Britain. May 10.—Captain 
M. Norman, R.N., Madeira, read before this Society a paper “ On 
the Effect produced on the Operator by the Poisoning of Plants in a 
Herbarium.” In consequence of using an alcoholic solution of 
camphor and corrosive sublimate in poisoning his Madeira plants, 
Captain Norman had suffered twice from severe salivation. It 
appears that the plants were kept in a room much frequented by 
him, and being thus under the influence of a mercurialized atmo- 
sphere, he had suffered in the way he described. In the conver- 
sation which ensued after the reading of this paper, it was stated 
that none of the operators, engaged in poisoning plants for the 
herbarium of the University of Edinburgh, had experienced any 
inconvenience. Mr. Gilbert Stuart said that he had slept six 
months in a room where poisoned plants were kept, and had not felt 
any bad consequences. The only inference that could be deduced 
from these facts was that Captam Norman, and probably others 
similarly organized, are peculiarly susceptible to the effects of 
mercury. 
AmericA.—The manufacture of white paper from wood is now 
quite a success at the Manayunk wood-pulp works, Pennsylvania, 
N. America. The wood used is that of the Liriodendron tulipifera, 
L., or Tulip poplar, and the Abies Canadensis, Michx, or Hemlock 
spruce. Itis brought to the works as ordinary cord wood, and is 
cut into chips by means of two immense machines, having cutters 
attached to rotatory discs, capable of cutting from thirty to forty 
