
NATURAL HISTORY MISCELLANY. 669 
is the chemical action of oxygen, which passes through the wall of the 
cell, and of which a portion is probably transformed into ozone under the 
influence of light, as occurs also in the globules of blood. The most 
strongly refracted rays of light have a marked influence on thes - 
rents, which are also no doubt affected by the currents of zr Poeni 
which form, under the DREI of water, between the surface of the leaf 
and the contents of the cells. The energy of the motion pools prirci- 
pally on the temperature, showing the greatest vigor between 16? and 209 
C. In the point of view of mechanical theory, we have here evidently 
an example of the eh mation of light and of heat into motion. The 
Anacharis is especially favorable for the observation of these motions ; 
as, in consequence of the transparency of its tissue, they can be watched 
under the microscope without any preparation. — Nature, London. 
eo — Of the eri ig va imas which seems to 
attract nsiderable Hci in England, Dr. Spruce, the denne 
PREIS traveller in South feine vati that it is sine: ess one of 
those varieties vesca co nly cultivated Penes the 
S agari 
Andes within the tropics, where the perpetual spring of that favored re- 
gion has had the effect of rendering hos strawberry perennially fruitful, 
and many of the deciduous-leaved t of Europe viri, dune In the 
Equatorial Andes the province of pesos is famous for its strawberries, 
which equal in size and flavor some of our best varieties, i. which are 
to be seen exposed for sale in the market- -place every day in the yu 
iecit REEN, Dec. 11. 
ANOTHER WHITE RIETY.— During the summer of 1868, while near 
the White sageta New Hampshire, I observed a white variety of 
Epilobium angustifolium. As I have not seen this mentioned in the Nar- 
URALIST, I contribute it to the list of floral albinos which has been so 
largely increased the past season. In the NATURALIST of several months 
ago, a white variety of Viola cuculata is spoken of by a Western writer. 
This color I do not think is unusual in this species, as I have observed it 
during the past ten years in Saratoga Co., N. Y., and have also seen it 
where. — HENRY M. Myers, Williamstown, Mass. 
BoTANICAL SPECIMENS. — A. H. Curtiss, Liberty, Bedford Co., Va., has 
botanical specimens (catalogue furnished) for exchange for specimens of 
Minerals, Geology, Shells and Insects. 

ZOÓLOGY. 
OCCURRENCE OF AN AMERICAN LAND SNAIL IN ENGLAND. — In a commu- 
nication to the November number of the ** Annals and Magazine of Nat- 
ral History," by J. Gwyn Jeffries, the occurrence of Planorbis dilatatus 
Gould, is noticed at Manchester, England. Since it was found in 
near the cotton mills, the writer suggests that in some way the eggs might 
have been conv eyed there in the cotton from America, and thus intro- 

