855 
In the investigation of the liver of a new-born calf were found, 
per kilo, 31 mgs. of copper and 81.1 mgs. of zine. 
From the. results obtained the following conclusions may be drawn : 
1. Arsenic is not a normal constituent of the, human liver. 
2. Copper and zine appear to occur regularly in the human liver. 
_3. They are already deposited in the liver during the foetal stage 
and, as regards copper, even in a larger quantity than in the. fol- 
lowing period. 
4. Otherwise, there seems to exist no relation between the copper 
and zine content of the liver and the age, sex, occupation and place 
of residence. : RE 
5. The figures given by LEHMANN for the copper content are com- 
paratively low. His maximum figure of 5 mg. per kilogram of liver 
is, as a rule, exceeded! in Holland. 
Pharmaceutical Laboratory 
University, Leiden. 
Chemistry. — “Zgqutlibria in ternary systems. LI’. By Prof. 
SCHREINEMAKERS. 
(Communicated in the meeting of November 30, 1912), 
In the previous, communication we have observed the changes 
when at a constant temperature there is a change of pressure, and 
from this deduced the saturation lines of a solid substance / under 
their own vapour pressure. We will now briefly consider the case 
that, at a constant pressure, there is a change in temperature. At 
a constant temperature a reduction of pressure causes an expansion 
of the gas region and a contraction of the liquidum region; under 
a constant pressure the same happens on elevating the temperature. 
A system that exhibits at a constant temperature a maximum 
vapour pressure (minimum), has at a, constant pressure a minimum 
boiling point (maximum). 
At a constant temperature, the influence of the pressure on the 
situation and form of the saturation line of / is generally small 
unless at temperatures close to the melting point of #; at a constant 
pressure the influence of. the temperature is usually much greater 
and the movement of the line, therefore, much more rapid. Yet, as 
a rule, the liquidum line will move more rapidly than the saturation 
line unless indeed the latter is on the point of disappearing. 
At a constant temperature, the saturation line of /’ may disappear 
on. increasing or reducing the pressure; this depends on whether, on 
melting, an increase or a decrease of the volume takes place. Under 
56 
Proceedings Royal Acad. Amsterdam. Vol. XV. 
