Brush and Penfield—Scovillite, a new phosphate. 459 
thermometers this property. 
The experiments thus far made are much less numerous and | 
complete than is desirable; and the authors hope they may be 
able at some future time to make additional experiments with 
the same and other bars, and also to investigate the properties 
of glass used for thermometers. ‘T'wo inferences are suggested, 
however, by these experiments, viz: 1st, that zinc is not a re- 
liable metal for one of the components of a metallic thermom- 
eter, much less for a standard of length; 2d, that bars of steel, 
copper and brass are not likely to vary in length appreciably 
at any temperature within the range of temperature to which 
standards are ordinarily subjected.* 
Arr. LXIX.—On Scovillite, a new phosphate ef Didymium, 
Yitrium and other rare earths, from Salisbury, Conn. ; by 
GerorGE J. Brush and SAMUEL L. PENFIELD. 
In October last, Mr. Joseph S. Adam, formerly an assistant 
in the Sheffield Laboratory, but now chemist of the iron fur- 
naces at Lime Rock, Conn., sent one of us a mineral he had 
discovered occurring sparingly as an incrustation on some of 
the iron and manganese ores from the Scoville ore bed in Salis- 
*The authors desire to acknowledge their indebtedness to Mr. T. Russell and 
: tus owned by them, and 
Mr. C. V. Mersereau for the loan of parts of the a ion of the copper and 
to Mr. G. Y. Wisner for assistance rendered in the preparati 
brass bars, 
