85 
from the tetrachloride by heating in a moderately hot zinc 
bath. 
The Dichloride is a non-volatile loose grey powder, with- 
out lustre or crystalline structure. It undergoes change on 
short exposure to air, and is converted by water into brown 
oxide, with evolution of hydrogen. Analyses of two 
preparations gave as follows : 
Calculated. Found. 
Tungsten W=184 72-15 73-00 
Chlorine Cl 2 = 71 27-85 26-35 
255 100-00 99-35 
Experiments made in the endeavour to prepare the 
chlorides WC1 3 and WC1 were unsuccessful. 
5. Tungsten Oxychlorides. 
The Monoxychloride WO Cl 4 , and the Dioxychloride 
W 0 3 C1 2 , have already been tolerably fully studied, never- 
theless we find that Persoz actually doubts the existence of 
these well characterised compounds, and Debray, obtaining 
abnormal numbers for the vapour density of the first of 
these bodies, is unable to explain his results. 
The splendid ruby red needles of the monoxychloride are 
best obtained by passing the vapour of a chloride over 
heated oxide or dioxycliloride in a current of chlorine. The 
crystals melt at 210'4'° and solidify at 206 - 7°; when heated 
more strongly the liquid boils at 227"5° C. (corrected), form- 
ing a red vapour rather lighter coloured than that of the 
hexachloride. On repeated distillation in chlorine over 
charcoal the hexachloride is formed. On exposure to air 
the red crystals become at once coated with a yellow crust 
of the dioxychloride. 
Analysis gave : — 
Calculated. Found. 
Tungsten W = 53-80 53 - 89 
Chlorine Cl* = 41*02 41*11 
Oxygen 0= 4-68 
100-00 # 
Debray found the vapour density of this body in sulphur 
