ctrode.
Various other alloys, being experimented upon, gave similar results.

I may also, in the last instance, mention that I have found the above
methods of electro-dissolution peculiarly adapted for the preparation of
unstable compounds such as stannic nitrate, potassic ferrate, ferric
acetate, which are decomposed on the application of heat, and in some
instances have succeeded by the following means of crystallizing the
resulting compound obtained.--_Chem. News_.

* * * * *

A NEWLY DISCOVERED SUBSTANCE IN URINE.

Dr. Leo's researches on sugar in urine are interesting, and tend to correct
the commonly accepted views on the subject. Professor Scheibler, a chemist
well known for his researches on sugar, has observed that the determination
of the quantity of that substance contained in a liquid gives different
results, according as it is done by Trommer's method or with the
polariscope. As sugar nowadays is exclusively dealt with according to the
degree of polarization, this fact is of enormous value in trade. Scheibler
has isolated a substance that is more powerful in that respect than grape
sugar. Dr. Leo's researches yield analogous results, though in a different
field. He has examined a great quantity of diabetic urine after three
different methods, namely, Trommer's (alkaline solution of copper); by
fermentation; and with the polarization apparatus. In many cases the
results agreed, while in others there was a considerable difference.

He succeeded in isolating a substance corresponding in its chemical
composition to grape sugar, and also a carbo-hydrate differing considerably
from grape sugar, and turning the plane of polarization to the left. The
power of reduction of this newly discovered substance is to that of grape
sugar as 1:2.48. Dr. Leo found this substance in three specimens of
diabetic urine, but it was absent in normal urine, although a great amount
was examined for that purpose. From this it may be concluded that the
substance does not originate outside the organism, and that it is a
pathological product. The theory of Dr. Jaques Meyer, of Carlsbad, that it
may be connected with obesity, is negatived by the fact that of the three
persons in whom this substance was found, only one was corpulent.

* * * * *

FURNACE FOR DECOMPOSING CHLORIDE OF MAGNESIUM.

[Illustration]

The problem of decomposing chloride of magnesi