ELISHA MITCHELL SCIENTIFIC SOCIETY 56 
peats from this and other localities to ascertain the presence 
of titanium. We have found no statements regarding the 
presence of this element in these ashes, although such a sur- 
mise was logical. Neither does chemical literature, as far as 
we have been able to examine, give any mention of the occur- 
rence of chromium in peats. Appended are the results of 
seeking for these elements in the samples mentioned above. 
Titanic Chromium Vanadium 
Sample. oxide. sesquioxide. pentoxide. 
Percentages 
in ash, 
Peatl:..@ OY Se 0.490 0.0283 0.00107 
eA AT. . Be tees a oc 0.340 0.0343 0.0026 
Peaw lil. Met... s4.- 0.491 0.0355 0.0031. 
In determining titanium the ash was decomposed according 
to the method of W. A. Noyes,’ namely, by fusion with 
sodium fluoride and potassium pyrosulphate. The melt was 
brought into solution with Dunnington’s’ necessary precaution 
in mind: vzz., having from five to ten per cent. of sulphuric 
acid present. Hydrogen dioxide was added according to 
Weller’s’ well-known method and the titanium determined 
colorimetrically. All hydrofluoric acid was driven off in the 
fusion and the hydrogen dioxide was free from that acid as 
well. Hillebrand* has shown the necessity for this. 
Chromium’ and vanadium’ were estimated according to the 
latest method of Hillebrand. 
A STUDY OF CERTAIN DOUBLE CHROMATES. 
BY W. G. HAYWOOD. 
Zehenter has stated (Monatshefte f. chemie 18. 48-55 Cen- 
1 J. Anal. Appl. Chem., 5, 39. 
2]. Am. Chem. Soc., 13, 220. 
3 Ber. d chem. Ges., 15, 2592. 
4 J. Am. Chem. Soc., 17, 718; Chem. News, 72, 158. 
5 J. Am. Chem. Soc., 20, 454: 
6 Jbid., 20, 461; Am. J. Sct., 6, 209. 
