954 APPENDIX. 
ance of elder pith, except that on pressure it permits to escape a very 
sweet juice. 
Under the microscope, at a magnitude of one hundred diameters, the 
specimen which is the object of our study resembtes a grain of sugar 
seen with the naked eye, and of which the appearance is of a brilliant 
whiteness ; the crystallization is like that of the most beautiful sugar. 
We remark on the edges a whitish liquid which oozes from it; in it 
we see some small cells, which are doubtless those which have permit- 
ted to escape the liquid which we have just noticed. 
Some moments’ rest in pure sulphuric acid changes the appearance 
of the specimen which we study ; the edges are yellow, the center rep- 
resents a bunch of grapes, of which the grains are perfectly distinct, 
and of a violet red color; some grains separated from the bunch have 
an appearance identical to those which we have observed in the pre- 
ceding experiments, except their violet red color; they are all perfo- 
rated with a hole in the middle. Some crystals are seen in the 
liquid. 
Anhydrous alcohol, added in the segment of sphere, produces a 
slight movement of oscillation from right to left ; the violet red color 
is unaltered; the edges only have assumed a tint much less yellow, and 
which has a tendency to disappear. As to the crystals disseminated 
throughout the liquid, they are always incolorous. 
The addition of the tincture of iodine gives, after a contact of some 
minutes, a color less deep; one would say that in place of coloring the 
substance, the iodine had, on the contrary, lightened it. However, by 
regarding it with the greatest attention, we distinguish little veins of 
an infinitesimal dimension, which appear colored violet. 
The piece of Chinese Sugar Cane submitted to the above experi- 
ments, was now taken from the liquid, then placed in the segment of 
a sphere, with anhydrous alcohol that we had increased with water. 
A portion of the fragment was dissolved ; at the bottom of the liquid 
we see a great quantity of white crystals. As to the mass itsclf, it is 
found at the bottom of the liquid, and presents the appearance of a 
mixture of empty cells, of crystals and granules, the whole seeming 
white by refraction, and tinted violet by reflection. 
A fragment imperceptible to the naked eye, submitted to a magni- 
tude of five hundred diameters, is completely identical with crystals of 
