Chemistry and Physics. 167 
_ The heat of fusion of gallium was determined by introducing a 
crystal into the surfused metal. e whole crystallized at once, 
and evolved heat which was eked: t 13°, the mean value 
The close correspondence of the two specific heats - haviaiy rape 
at nearly the same pe ere ture, is Pa also of mercury, lead, t 
and bismuth. The atomic heat o f gallium in the liquid state is 
69°9 X 0°0802—=5'59; in pee —- 69°9 * 0°079=5'52. acs bere 
Phys., V, xv, 242 , Oct. ij 
. On t ce be Yiterbia in Ses pres <The pen! 
called sipylite ik, "abase ibed by MALLE new niobate, as 
ee in Amherst county, Virginia, paler eir with “allsnite.? 
analysis was made of it by Brown in his laboratory, who found 
that, among other things, it fesicvins2 28 per cent “ earths sup- 
posed to be erbia and y ttria in the ratio of 27 to At the re- 
quest of DeLaronTarng, a portion of this mixture oy earths was 
sent to him by Mallet. Its pale yellow color indicated to him the 
presence of terbia or philippia, if not of both. But the feebleness 
of its absorption spectrum, and the ve weak rose color of its 
nitrate and oxalate led him to believe that if no error had been 
Marignac’s ms few sansantel: the sharsetsiaion of which accord 
so well with that of his new earth as to leave no doubt of their 
identity. The discrepancy in atomic me ho be a terig: tgs! 
pet determinations.— (. R&., lxxxvii, 933, Dec 
‘pon the develo opment of Electricity as hs serio of 
rheinions i —In this paper H. F. Brawn discusses the equiv- 
 alence of heat and work, and aclerardivie cael ate by heat and 
_ work. Some of his nosiebonions bear directly upon the question of 
_ dynamo-electric machines. He proves that with electricity of high 
tension, the per cent of potential electric energy which is con- 
verted into work is less, the eased under like conditions, the ten- 
_ Sion is: That heat never can be wholly converted into electricity ; 
* This Journal, III, xiv, 397, Nov., 1877. 
