54 
PROCEEDINGS OF THE 
1838. 
JANUARY 4th. 
Dr. Francis Bossey, in the Chair. 
JANUARY 19th. 
Daniel Cooper, Esq., A.L.S., Curator, in the Chair. 
These two evenings were occupied with Mr. G. E. Dennes’s 
paper translated from the Annales des Sciences Naturelles 
for March 1837, “ On the structure and development of the 
l generating organs of a species of Marsilea” found by M. Es- 
prit Fabre about the environs of Agde. 
FEBRUARY 2nd. 
W. H. White, Esq., in the Chair. 
Mr. Woods presented the Society with a New Botanical 
Thermometer ; and communicated through the Secretary the 
following remarks : — 
On the Influence of Barometric pressure on Plants, fyc. 
In presenting the Botanical Society of London with an 
Improved Botanical Thermometer, I intend, in this short 
communication, to offer a few remarks on the influence of 
Barometric pressure on some species of plants, particularly 
exotics. 
The effects of Barometric pressure on the animal and ve- 
getable kingdom are plainly discovered in the instances of 
quadrupeds of the inferior class, and plants found on moun- 
tains, and other elevated situations. The influence of tem- 
perature, or the effects of heat, when it exceeds the mean of 
such localities, is not so influential on the physical growth 
of plants as the increase or diminution of pressure. This 
will appear obvious on comparing the size of plants in such 
situations with those of the same kind in less elevated parts 
