( 828 ) 
We may finally remark here that Jourpois') thinks he has shown 
with certainty that there are not two but three solid modifications 
of the phosphorus, white, red, and pyromorfic phosnhorus, which 
last we shall call violet phosphorus, as is more rational. 
As Jorrois remarks it would also follow from his investigation 
that the violet P is stable under 460°, above it, however, the red 
modification, which melts to a colourless liquid at 610°. 
When we accept these results it is the question how we can 
account for the behaviour of the phosphorus in the light of the new 
theory. 
We might suppose that if three different solid modifications exist 
of a substance, these three forms would have to be ascribed to 
the existence of three different kinds of molecules. 
This view has, accordingly, been advanced in the first communi- 
cation, but if we think of substances with three, four, or more points 
of transition, this supposition is somewhat improbable, aud as it 
proves on further consideration not to be necessary, we prefer another 
simpler and more plausible supposition for the present. 
Also for the case that a substance occurs in three crystallized 
modifications, the existence of two kinds of molecules can account 
for the phenomena, namely, when we assume a second discontinuity 
in the series of mixed crystals. 
This has been done for the phosphorus in fig. 6; we see that the 
liquids 6/7 coexist with the mixed crystals bs’, the liquids /e being in 
equilibrium with the mixed crystals se. 
In this figure s, represents the red phosphorus at the unary melting- 
point temperature. Below this temperature, which lies at 610° according 
to Jomsors, the red phosphorus remains stable to 460°, at which 
the red modification, which is denoted by s,, is converted to the 
violet S,, which is therefore stable below 460°. 
We may further remark that as red P is obtained on a manu- 
facturing scale from yellow P by heating to 280°, the line /,/, must 
be left and the line s,s',, reached, which however, is also still meta- 
stable, and that then, as JortBors found, by means of the catalytic agent 
Jodium, the stable state at that temperature, the violet Pis obtained, 
which lies on the line 5,9. 
The second substance which was examined as to its complexity, 
was mercury. As only one crystallised state is known of this sub- 
stance, and as not one of its properties betrays a complex character, 
1) Comptes Rendus 149, 287 (1909). 
151, 382 (1910). 
hed 
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