220 Scientific Intelligence. 
a 
which may be easily brought to +4 of that of Daniell’s battery without — 
decomposing the mineral. In one experiment Bunsen found the electro- _ 
motive force of pyrolusite and platinum not less than gs! of that of Daniell’s — 
battery, but the resistance to conduction was 18°4 times as great as that — 
of the Daniell’s cell used for comparison.— Pogg. Ann., exxii, 505. be 
Oe: ae 
4. On the thallie alcohols—Under this term Lamy has described the 
compounds which are formed by replacing an equivalent of hydrogen in. 
wood-spirit, common alcohol, &e., by an equivalent of thallium, and which 
are represented respectively by the formulas “s Ti Ue. Cs 1 bon 
Grol, f O,, &e. Methyl-thallic alcohol is solid and crystalline. The | 
All three compounds burn in the air with a green, more or less brilliant 
flame, and all are soluble in the corresponding alcohol or in ether. Chlo- 
roform also dissolves thallic alcohols, but the solution is soon decomposed . 
with deposition of protochlorid of thallium. Water decomposes these 
= Comptes Rendus, lix, 780. 
2 cone a popular, but at the same time precise and ween tar oo of 
_ Faraday justly calls the highest law i ical science—the primey ct 
2 sie y justly calls the highest law in physical science + ght re ms 
Th Correlation and Conservation of Forces. A Series of Expositions, by Prof 
e, Prof. Helmholtz, Dr. Mayer, Dr. Faraday, Prof. Liebig, and Dr. Carpets 
es duction, rt ;: the Chief Promoters et 
y Edwar 43g, N. Y.: DAP 
