on the Equivalent and Spectrum of Cesium. 95 
which, unlike Bunsen’s chlorid was not perceptibly deliquescent 
even in a very moist atmosphere. The spectrum of the chlorid 
thus prepared was identical with that of the original bitartrate. 
Both salts gave a red line nearly coincident with the @ line of 
lithium. In order to determine whether this line was due to a 
trace of lithium or belongs to the spectrum of cesium, a portion 
of chlorid was again precipitated with a relatively small quantity 
of bichlorid of platinum, the precipitate was most thoroughly 
washed and from it a new sample of chlorid of cesium was pre- 
Mid; the product thus procured gave a spectrum identical with 
that from the original bitartrate. 
Be it not deliquescent, but it is hardly hygroscopic. The 
unfused and porous salt may be weighed in moist air with as much 
accuracy as chlorid of sodium. After it has been fused it does not 
alter in Weight during 24 hours’ exposure to the air in cold dry 
Weather. It may be fused in a platinum capsule over the gas 
Ma first estimations of cesium in this form were too low by 4 to 
tenths of one per cent. 
ts nitrates of cesium and silver, after the latter had 
bea original chlorid and the whole was partially precipitated with 
Ichlorid of platinum and a second portion of chlorid of cesium 
about half the cesium was again thrown down as platinchlorid, 
meat this product another estimation of chlorine, IV, was 
