Linnean Society of Paris. 381 
exemplified in extensive districts of Germany and Italy, in or 
about the lower Alps and Appenines ; and it is now still fur- 
ther ascertained, that not only metallic, but ligneous or vege- 
table points, can divert torrents of electricity in different cur- 
rents ; also, that this element is as necessary to plants as pure 
late sowing, during autamn, or in October. A musiake in 
this respect, should a soil be clayish, or otherwise subject to 
jate droughts, may prove ruinous ; and since it is not given 
to human wisdom to foresee how and when hygrometic vicis- 
i been ingeniously devised to 
he rainy days in the course of 
y—then of the rainy days of each 
September; and by the proportion 
to judge of the next approach- 
‘se October completion, on a certalty of forty-six against 
‘a . These ae Mr. President, J} will be happy to fur- 
nish the Horticultural Society with. pines 
é Tn relation to horticulture, the London and Paris mem- 
bers have concurred in the ome method ent po od 
: - 4 of climate each precious plant requires. 
defining what kind of clim t ee ee 
e consists in temperature, moisture, elec- 
tricity, light, = irradiation of pl 
lity of the soil. ghee 
pee spontaneous exsiccation of the plants, and on ged 
relative location, under which the requisite conditions of c 
mate are to be artificially procured or modified, are Segoe 
Jarly novel and interesting. 
