then with ether, and brought under a desiccator with concentrated
sulphuric acid. In order to purify the substance, it is dissolved in water
and treated with bone-black. The solution is then evaporated to a sirup,
and this poured into a mixture of equal parts of anhydrous alcohol and
ether. In this way the new compound is obtained as a very fine, pure white
powder which rapidly settles. It has much the appearance of starch. Under
the microscope it is perfectly amorphous. In the air it deliquesces much
more rapidly than ignited calcium chloride.

Treated with dilute mineral acids or oxalic acid on the water-bath
gallisin is transformed into dextrose. It does not ferment when treated in
water solution with fresh yeast. The analyses led to the formula
C_{12}H_{24}O_{10}. When treated under pressure with three times its
weight of acetic anhydride at 130-140° it dissolves perfectly. From the
solution a product was separated which on analysis gave results agreeing
with the formula C_{12}H_{18}O_{10}(C_{2}H_{3}O)_{6}. The substance
appears therefore to be hexacetylgallisin.

Physiological experiments on lower animals and human beings demonstrated
clearly that gallisin has neither directly nor indirectly any injurious
effect on the health.--_Berichte der Deutschen Chemischen Gesellschaft,
17, 1000; Amer. Chem. Jour._

* * * * *




THE COMBINING WEIGHTS, VOLUMES, AND SPECIFIC GRAVITIES OF ELEMENTS AND
COMPOUNDS.