927 
will immediately overburden cells *). Only if care is taken that this 
does not happen benzaldehyde can be used as nutriment. 
As follows from the above this is the case when we use very 
slight concentrations of benzalhyde. Amygdalin which is among the 
substances that do not cause overburdening phenomena can be 
converted zm cells into glucose, benzaldehyde and HCN without any 
slackening influence on the growth’). 
In the communications mentioned we have demonstrated that 
generally speaking it is not the nature of the substance absorbed 
but in the first instance the quantity, that causes overburdening of 
cells and the accompanying retarding of growth. In this way we 
have at the same time a specific for bringing narcotic substances 
into the organism without any harm to the latter. 
For this purpose the narcotic substance should be combined with 
one or more other chemical compounds, so that a complex chemical 
compound results, which can not overburden cells, but from which 
the desired active substance may be formed within the cell. 
Dordrecht, December 1916. 
Chemistry. —- “Jn-, mono- and diwariant equilibria.” XIV. By 
Prof. F. A. H. SCHREINEMAKERS. 
(Communicated in the meeting of January 27, 1917). 
22. The occurrence of three indifferent phases; the equilibrium J/ 
is constant singular. 
In the previous communications we have discussed the occurrence 
of two indifferent phases; now we shall briefly consider the occur- 
rence of three indifferent phases. 
Again we take the two reaction-equations : 
Tis ie +... arb + Ap+i Peay Set te To ON eee 
and 
Pee ee dE pd Ho Opr Fido Oo tred) 
in which a, and uw, are positive and at the same time: 
EN el pl DE ek RT aL) 
When we put: : 
1) J. BöesEKEN and H. J. Waterman, These Proceedings, January 24, 19'2 
p. 608; H. J. Warrerman, Dissertation Delft, 1913. 
2) When at the same moment any conversion into the just mentioned 
substances occurs too outside the ceil of course retarding of growth will all the 
same be stated. 
