803 
< AcB-LAE” 13: 
Number of grammes NH,Br to 
100 Grammes of Hg 
NO. t error 
calculated found 
4 121.8 169. 4° 169,4? + 0.0? 
5 128.0 177.06 176.9' — 0.15 
6 131.1 180.98 180.97 — 0.0! 
yi 134.6 185.44 185.46 + 0.02 
8 137.69 189.39 189.5” + 0.1! 
8 137.65 189.3! 189.5” + 0.19 
9 142.05 193.83 193.79 — 0.04 
10 | 144,75 196.63 196.63 0 
11 147.65 199.65 199.43 — 0.22 
12 149.7 201.79 201.79 0 
13 152.6 204.83 204 . 76 — 0.07 
14 157.95 "210.49 210.66 + 0.17 
This value for the transition point can, in my opinion, only 
deviate a few tenths of degrees from the real value. 
18. It can be derived from the results of §§ 15 and 17 that the 
transition point of ammonium bromide lies at 187.4°, a value which 
within the errors of observation agrees with the value found by 
SMITH and BasrrackK. In the thermal determinations the retardation 
on cooling appears to have been destroyed by the catalyzers glycerine 
and glycol; in case of rising temperature some retardation continues 
to exist in spite of the catalyzer. 
19. Thermal determination of the transition point of ammonium 
ode. 
I have succeeded in demonstrating the existence of a transition 
point of ammonium iodide unknown up to now by thermal experiments. 
In these experiments the same difficulty presents itself as 
for NH,Cl and NH,Br. On cooling a value is again found that 
lies lower than that which is found from the curves of heating. 
For my experiments [ used a preparation of SCHERING, which as 
appears from the analysis (expulsion of iodine by NaNO, and H,SQ,) 
