618 WILLIAM LAWTON GOODWIN ON THE NATURE OF SOLUTION. 
chlorine hydrate, a generally steep ascent to the maximum and rapid fall after 
passing that point. 
The coefficients in the foregoing results express the volumes of chlorine 
measured at 0° and 760 millimetres pressure absorbed by unit volume of the 
solution measured at the temperatures of estimation. Probably new relations 
would appear if they were stated as weights of chlorine absorbed by unit 
weight of the salt and its accompanying water. The data necessary for this are— 
(1) amounts of chlorine absorbed at particular temperatures, and (2) the 
specific gravity of the solutions containing chlorine at those temperatures. The 
weight of chlorine being known, the weight of chloride could be easily found. 
In a second research on this subject, it is proposed to follow the course 
indicated. Such determinations were made for water, and it was found that 
the absorption of chlorine increases the pews gravity of water, as the follow- 
ing numbers will show :— 
Sp. gr. of Chl. Water. Sp. gr. of Pure Water. 
orb van. 1:004.06 0999980 
8°-0 100494 0:999886 
16°3 1:00424 0998954 
eee) 1:00264 0997601 
29°-0 1:00069 0996051 
25°°5 0°99984 0°994247 
Taking a general survey of the curves as grouped in the diagrams, the — 
following facts are remarked :—~- 
1. There is a general tendency towards coincidence at high temperatures _ 
(Plate XXXVI, Diagram 1.). 
2. The curves for the mixed chlorides, where chlorine hydrate is formed 
with both single chlorides, follow a mean course very closely ; in cases where 
one of the chlorides only prevents the formation of the hydrate, the curve does 
not always follow such a mean course between the curves for the single 
chlorides (Plate XX XVI., Diagrams I1., IIL, Iv., V., VI., and VIL). 
'3.. The solubility of Mines in watoe is | nee by the presence of 
lithium chloride, hydric chloride, and, perhaps, manganese chloride (Plate 
XXXVI., Diagram 1.). 
4. The presence of chlorides affects the solubility of chlorine in water 
chemically at low, but mechanically at high, temperatures. 
This research was carried on in the Chemical Laboratory of University 
College, Bristol, during the first six months of 1882, and I have to thank 
Professor Ramsay for many valuable suggestions. 
