Prof. J. Le Conte on the Freezing of Vegetables. 195 
last sinking peak: another period, and this had gone—the island 
ad sunk, leaving only the barrier at the surface and an islet or 
thrown around the lofty island to beautify and protect, becomes 
afterwards its monument, and the only record of its past exis- 
ce, 
Aur. XV.— Observations on the Freezing of Vegetables, and on 
the Causes which enable some Plants to endure the action of 
extreme Cold ; by Joun Le Conte, M.D., Professor of Natu- 
tal Philosophy and Chemistry in the University of Georgia. 
(Coneluded from page 92.) 
= 
formation in relation to the condition of the fluids of the proper 
respect to the state of the juices contained in the succulent layers 
of the inner bark. During their progress, I endeavored to exam- 
ine some transparent sections of the plants by means of a com- 
pleasant to carry on such observations in the open air, that I de- 
Investigation. With this view the following experiments were 
instituted ; the frigorific agent being a mixture of snow and 
Common salt. : i 
For the pupose of testing the effects of cold, I selected the in- 
ternodal portions of a vigorous freshly-cut elder stalk (Sambucus 
canadensis), of about one inch in diameter: the diameter of the 
pith was nearly one-half that of the stalk. The pith of this 
plant is surrounded by a zone about one-twentieth of an inch in 
thickness, which is more succulent than the central portions of 
the pith proper, and from which fluid could be readily pressed by 
lateral compression in situ with the back of a knife. A smaller, 
PO tie i et 
