178 Proceedings of the Royal Society 
change as the original juice does, and in other respects it is a very 
stable body. 
The acid, dried at 110° C., and analysed, gave the following 
results : — * 
I. 
II. 
Mean. 
Theory for 
Ci 4 Hi 8 0 2 demands 
Carbon, . 
77-09 
77-01 
77-05 
77-06 
Hydrogen, 
9-28 
8-75 
9-01 
8-28 
Oxygen, . 
13-63 
14-24 
13-94 
14-66 
100-00 
100-00 
100-00 
100-00 
The acid possesses very poisonous properties, and produces a 
most disagreeable itching sensation when applied to the skin. 
Although it does not act with equal severity upon all persons, the 
attack is worse when one comes in contact with it for the first time, 
subsequently the effect of the poison is very little felt. An im- 
mediate application of strong solution of acetate of lead to the 
inflamed part is the most effective remedy. 
From the alcoholic solution of the acid many metallic salts can 
be produced, most of which are slightly soluble in alcohol, but 
almost insoluble in water. 
Lead acetate gives a greyish fiocculent precipitate — a very 
characteristic reaction of the acid. A quantity of this compound 
was prepared by precipitating an alcoholic solution of the acid with 
the lead salt. The precipitate, after being partially dried over a 
water-bath and in a dessicator, was analysed, and its composition 
found to be — 
Found. 
Theory for 
(duH^O^Pb requires 
Carbon, . 
52-08 
52-40 
Hydrogen, 
5-34 
5-30 
Oxygen, . 
10-13 
§10-01 
Lead, 
32-45 
32-29 
100-00 
100-00 
This lead compound is a somewhat unstable body; when heated 
in an air-bath to 100° C. it gives off a peculiar odour, and turns 
darker in colour; at 110° to 115° C. it melts, and becomes a dark 
* Analysed by Mr Hiraga. 
