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| American Journal of Science. 5 
~lnF 
= aa? 
5 . 
DANIEL DAVIS, Jr. 
No. 11 Cornnitt, Bosror, Mass. | 
. Manufactures and keeps constantly for sale, 
Instruments to illustrate the Principles of Ganvantsm, EvectRo- 
Dynamics, Magnetism, Evectro-Macnetism, Macneto-Evec- 
Tricity, T'HEeRMo-ELEcTRICITY. 
aG- Improved Maeneto-Execrric Apparatus for Medical use. 
Colleges, Academies, and School Teachers, supplied on the most! 
reasonable terms. 
Will shortly be Published, 
A MANUAL OF MAGNETISM, 
INCLUDING 
-E LE 
BY DANIEL DAVIS, Jr. 
Assisted by several scientific gentlemen. 
MAGNETISM, ELECTRO-MAGNETISM, MAGNETO-ELECTRICITY, AND ALSO 
THERM ICITY. 
This work, though mainly intended as a companion to Davis’s 
Magnetical Apparatus, will comprise a sufficiently full account of th 
elementary principles of those branches of science of which it treats, 
