14 JOURNAL OF THE 
is present. It would seem then, that alcohol precipitates 
out the body and makes it available for analysis and exami- 
nation. Ifa portion of this green, gummy mass is taken 
and dissolved in water, it exhibits the same behavior to- 
wards barium chloride as has been observed in the green 
solutions. In one or two cases it was observed that the 
part remaining dissolved in the alcohol yielded practical- 
ly all of its sulphuric acid to barium chloride in the cold. 
The green mass was thoroughly washed with alcohol and 
dried over sulphuric acid. It also dries to a brittle mass 
if exposed in thin layers to the atmosphere. It is quite 
insoluble in alcohol, but soluble in water. A number of 
preparations of this substance were made and analyzed 
and the results are in such agreement that one is inclined 
to believe that the substance is a definite compound. 
Fifteen grams of chrome alum were dissolved in 100 cc. 
water and boiled for one hour to a concentration of fifty 
cc. ‘This was cooled and precipitated by the addition of 
100 cc. of absolute alcohol. The green mass obtained on 
drying weighed about eight grams. This was carefully 
analyzed : | 
Calculated for Found. 
7K2SO45. re(SO4)3Cre(OH)¢4.H,0O. I. aT: III. IV. 
2h Ra at etna a GR 18.07 18.23 18.32 1802 17,76 
eee ces ft a be ote 15.88 15,18 15.63 15.78 ae 
SL eS ee Sh 5 61.08 60.55 60.73 02 eae 
Analysis III and 1V were from other preparations, 
made, however, in a similar manner to that just describ- 
ed. This substance appears to have quite a complicated 
constitution, and it is not easy to see the part played by 
the potassium sulphate. It do esnot seem to be a matter of 
accidental occurrence, however. ‘The important feature 
is that the saltisa basicone. Siewert gives, as the result 
of his analysis, 6K,O0.5Cr,O,.18SO,.H,O, for which the 
following percentages would be required: Cr,18.7; K, 
16.8; SO,, 61.9. While these percentages differ some- 
what from those obtained by us, the agreement is suffi- 
