214 Miscellanies. 
chapters on important subjects, and has posted up the science to the 
date of his preface, April, 1833. 
The favorable opinion which, many years ago we formed and ex- 
pressed respecting this work, is now, at last, fully confirmed by that 
of the British scientific public ; namely, that Mr. Bakewell’s Geology 
is admitted to be the best elementary work for instruction on that 
subject in the English language, and perhaps in any language. We 
understand from direct and unquestionable sources, that this is now 
admitted in the Universities of England and Scotland, as well as by 
eminent®* geologists in various parts of the United Kingdom. After 
investigating geological subjects through many volumes of the various 
existing treatises, we have usually returned to Mr. Bakewell for a 
final judgment, and have been often forcibly struck with his judicious 
summary of geological facts and opinions, and with the rare combina- 
tion of copiousness, condensation and persplcutty, which his work 
presents. 
18. Magnetism.—Dr. Locke, has within the last week, invented 
and constructed a very delicate Thermo-electrical battery, intended to 
show the electricity produced by animal heat. It is of the size of 
three sixpences laid upon each other, that is, three-fourths of an 
inch in diameter, and one tenth of an inch thick. ‘This battery, 
being attached to his galvanometer, and the end of the finger 
applied to the top of it, the animal heat thus communicated to it, 
caused a current of electricity, which turned the magnetic needle 
90°. Independently of this little battery, the two following experi- 
ments, have been made by the galvanometer. One fourth of a 
grain of metallic antimony being interposed between two copper 
wires, and the warmth of the finger applied, the needle was deflect- 
ed 22°. One of the copper wires being laid upon the other, without 
the interposition of any other metal, and the warmth applied as above 
the needle was deflected 6°. ‘The same results were obtained by 
substituting the warmth of the breath instead of that of the hand. 
It may be proper to note that the temperature of the room in which 
- these experiments were made, was 65° Fahrenheit. 
It has thus been actually shown that the production and expenditure 
of animal heat, are, constantly, attended by electrical and magneti- 
cal currents.— Cincinnati Paper. 
* It has been used since 1815, in connexion with the geological lectures in Yale 
College, and two editions of the work, each with an appendix, have been published 
under the revision of the Professor in that department. 
