‘60 Scientific Intelligence. 
ae eerneerd to a distance of at least 40 kilometers neti 
id ga 8 Rendus, Oct. 6, Hct, , 
Pee Prostriet ity.— —F. Koutravscn has neppocied the 
theory of the bir a of shevinieselaonricity result from the 
interchange of heat and algetricity, the one carrying the other 
and aed Stl energy. This theory has been called the 
Mitfihrungstheorie. Budde acknowledges that this theory ex- 
plains many of the phenomena of thermo-electricity, eee shows 
he 
not urge any crucial ip epee, for none exists which can test 
or der to agree with the second law of thermo- -dynam s it § teqaire’, 
that the phenomenon of the thermo-electric shade should be 
n 
rergig hon between electricity and heat in thermo-electric phe- 
nomena, lies in this, that one can perceive that there should be 
differences of aistehation of heat when there are differences of 
heat level; but it is difficult to perceive that there should be an 
electrical current where there is no such difference. Kohlrausch 
‘Chemie, No. 11, 4, pp. 477-4 
4, 
Therm ee relations io oinias —The peculiar ent 
acter of mercury makes it very hea fo a standard of electri- 
eal resistance, and C. L. Weber urges its employment as 4 
standard metal of reference in shermo-clectricity instead of lead, 
