42 ROYAL SOCIETY OF CANADA 
Ezxperiments. 
In the spring and summer of 1899 the writers carried out a lengthy 
series of experiments on the action of potash and ammonia on the 
chloride of lead. The less basic of the oxychlorides are formed with 
remarkable slowness ; the reaction between N/3 ammonia and lead 
chloride not coming to a standstill in ten days shaking at 100°C. 
PbC1,3PbO, however, was formed in a few hours in the cold. 
In the winter of 1900-1901, Mr. Good took up the study of the 
action of water on antimony tri-chloride, presenting his results as a 
thesis in competition for the 1851 Exhibition scholarship. His observa- 
tions may be regarded as confirming the individuality of the oxychloride 
2SbCIL,5Sb,0, in the powder of Algaroth ; although in this case also 
equilibrium is often not attained until days after the precipitation. 
Mr. F. B. Allan, Lecturer on Chemistry in the University of 
Toronto, has just completed a series of experiments on the action of 
water on the nitrate of bismuth,1 which he has presented as a thesis 
for the degree of Ph.D. His results, some of which are represented in 
the curve on page 38, establish the existence of basic nitrates of the 
formule. Bi,O,.N,0,.2H,0, 2Bi,0,.N,0,.0,0, 6Bi,0::5N°0/9EP08 
while although precipitates were obtained intermediate in composition 
between the two last named, they were obviously mixtures. Two of 
these latter have found their way into the literature as the “compounds” 
5Bi,0,.4N,0,.9H,0, and 11Bi,0,.9N,0,.21H,0. 
Mr. Wilson has been engaged during the past Easter term with 
experiments on the precipitation of cupric chloride by potash. With 
n/5 solutions at 85°C. the precipitate consists altogether of CuCl,.3Cu0. 
2H.O until all the copper is removed from the solution; on further 
addition of potash the precipitate turns black, no potash remaining in 
the solution until the precipitate is totally converted into the oxide. 

t Amer. Chem. Jour. 25 307. (1901.) 
Ts eS ae ee 
