Chemistry and Physics. 259 
2. On some thermo-electric elements of great electro-motive power.— 
Sreran has examined a variety of mineral substances with relation to 
i i ratu mi 
a galvanometer of great rea and the co 
by a spirit-lamp. In examining the mutual relations of the minerals 
& copper strip was placed pre them, wires attached to the free ends 
of the fragments of mineral and the whole pressed together by a wooden 
press. The free end of the copper strip was then heated ind the heat 
conducted to Ne panes In the following enumeration of the cil i 
employed the positive element is always placed first, and the number 
appended signifies how many of the elements give an electro-motive ove 
equal to that of Daniell’s cell. 
C .) ee Ps hiesiie 58 26. 
) Pee 
Compact copper syria Sh copper pyrites; 14. 
ts Copper—crystallized cobalt pitseng: 26. 
(6.) —— cobalt pyrites— ; 78. 
(7.) at —iron pyrites ; 157 
(8. Ae copper pyrites—iron pyrites; 6. 
(9.) Flin copper pyri 2s. 
(10.) C —erubescite ; TK: 
(11.) Fine b ie eif—copper 9°8. 
(12.) Coar “ 
ae 
a ) tiie in large erystale—coppers 9°8. 
14.) Bleisch weif—erubescite ; 
The great influence of structure upon the t 
seen in Nos. 1, 2 and 4, and still more in 5 and 6. 
crystals of galena was at some poin nts 2 at others 
elec tro-motive force yet 
os -apapabpd relations is 
of enbical 
Per, brass, silver, cadmium, iron, antimony, co 
Pegg. Ann., exxiv, 632. 
8. On the wave length of the blue iridium line.-—J. Miitter has Jae 
‘ine characteristic. of, the new 
o determinations A= 0-000455™. —— 
see? 
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