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Chemistry and Physics, 507 
For the zirconium determinations, a material was used which, 
as shown by analysis, consisted of zirconium = 53, silicon | 5°44, 
aluminum 40°36 = 100°33. It was homogeneous in appearance 
and was — up of metallic scales resembling pear It gave 
as follow 
i. HH. 
Weight of = rempatee el es i eee G, 1°3019 13019 
Weight of glass case, __..__-- Gy, 0°1781 01781 
Temperature of the axis 2 Belge 8 t, 99-7° 99°75° 
Duration of the expt., M,-M,, 30’ 357 
t 
Scale-motion before expt.,_._- ve +0°137 +0111 
0 
t 
Scale-motion after expt.,..__- Pa +018 +0'14 
Oscillation during oe cee Q—-a 294°1 296-2 
Corrected scale-motion, _.--_- eo 298-85 300°59 
Pans heat. 2c osc lke S, 0°1313 071321 
Correcting this result by ve nag bere a given, the authors 
nd for the specific heat of pure zirconium the value 0°6666, and 
expression for zir 
The boron, whose "ejeciti heat was determined by Mixter and 
ae soueinted for = art of well-formed crystals, wana 
the following composition; Boron 90°18, aluminum 9°82= 
The Specific heat of this substance, as obtained in two determina- 
tions, is given as 0°2472 and 0°2489. Calling the apr heat of 
aluminum 0: 2143, the specific heat of pure boron becomes 0°2518, 
and its atomic heat 2°745 ; or, taking its atomic weight ot 545, to 
bring it into accordance with the other determinations, 1 ‘3725 3 : 
thus confirming the results of Regnault and Kopp, and giving a 
much smaller number than is required at Dione and Petit’ s law. 
—Ann. Chem. Pharm., clxix, 388, Oct., B, 
onstant Normal Flame Bes necessities of Feat 
lhonctey as well as exact scientific research require e the use 0 
a’ normal flame constant in ¢ e d uniform in results. 
This is far from being the case either with the generally use sed 
Standard candle, the carcel lamp of definite form and size as used 
in n France, or the pure ethylene gas flame used in Germany. 
Water manometer. This cylinder is filled aa a 275 ondinaty 
ether, and the water pene k of it is heated to 
periments, 4950°81™™* and will remain constant for an hour. 
now the fine screw be o opened slightly, the ether vapor passes, 
under only three or four millimeters of water pressure, to the burner, 
and, being ignited, burns with a brilliant white flame resembling 
