( 1163 ) 
The facts here stated may lead to various theoretical speculations, 
important for the physiology of the centralnervous system, and in 
a further communication I hope to bezable to develop the theoretical 
views following from our data, views touching on different questions 
concerning the morphological foundations of the physiology of the 
spinal cord, the functions of this organ and of the central nervous 
system generally. 
The conclusions, which I would propose as a summary of the 
results of these researches, in as much as they concern the special 
question about shape, situation and extension of the strychnine-segmental 
zones, are the following: 
I. After segmental application of strychnine on the dorsal surface 
of the spinal cord the strychnine-syndrome, demonstrated by me, 
appears in sharply circumscribed skinfields, which are identical, as 
regards their shape, situation, and extension, with the dermatomata 
defined by means of the isolation method. 
I. Jn this strychnine-method, i.e. the segmental, strictly localized 
application of strychnine on the dorsal surface of the spinal cord, 
we have got a new method, fundamentally different from all other 
hitherto known methods, for the definition of the dermatomery of 
the body. 
Chemistry. — “Lquilibria in the system: Water — Sodium sulphate 
| — Sodium chloride — Copper sulphate — Cupric chloride”. 
By Dr. F. A. H. SCHREINEMAKERS. 
(Communicated in the meeting of March 25, 1911). 
1. INFRODUCTION. 
In a previous communication’) I discussed the equilibria which 
occur at 30° in the system: Water — Ammonium - sulphate 
— Ammonium chloride — Copper sulphate-Cupric chloride. I have 
now replaced the ammonium salts in this system by the corresponding 
sodium salts. This causes the equilibria to become more complicated, 
and also their form to be more dependent on the temperature. For 
this reason I have also investigated this system at different tempe- 
ratures viz. at 35°, 25° and 15°. 
At first sight one might think that the system is built up of five 
1) These Proceedings XI p. 615. 
