354 The American Geologist. December, 1894 
to win a recognition among educators and scientists. He 
made rapid progress toward the front. His inventions were 
numerous and his publications were of the highest value both 
in physics and geology. For seventeen years he held an im- 
portant professorship in one of the leading institutions in the 
central portion of the United States, and at his death it was 
truly said that the country had lost one of its foremost citi- 
zens. 
The following list of Dr. Locke's publications is probably 
complete for his geological contributions. There is mention 
made, amongst the memorabilia sent by Mr. J. B. Locke, of 
an English grammar, and a "pamphlet on Toxicology," but of 
these no further information can be obtained. 
List of toe Publications of Dk. John Locke. 
Outlines of Botany. 1810. 
The microscopic compass: invented by John Locke. Am. Jour. Sci., 
Vol. XXIII, 1833, pp. 2:17-243. 
On a large and very sensitive thermoscopic galvanometer. Phil. Mag., 
London. 1837. [Reprinted in Am. Jour. Sci., XXXII, pp. 365-368, 1838.] 
Magnetical observations at Dayton, Springfield, Urbaua and Colum- 
bus, Ohio. Jour. Franklin Institute, (Jet. 183S. 
Geological report communicated by the governor to the General As- 
sembly of Ohio. Dec, 1S38. Addressed to Prof. W. W. Mather, princi- 
pal geologist of the survey, 66 pp. octavo, 15 plates and a colored geolog- 
ical map of Adams county. Published in the second report Of the first 
survey . 
Report on the explosion of the steamboat Moseler, 1840. 
Electricity in steam. Contributed to the National Institution for the 
Promotion of Science, Jan. 22. 1841. [Apparently not published.] 
On a new species of trilobite of very large size. Am. Jour. Sci., 1842, 
XLI1, p. 366. 
Alabaster in Mammoth cave. Kentucky [Illustrated]. Am. Jour. 
Sri.. XLII, p. 206. 1842. 
On the manipulations of the dipping compass. Am. Jour. Sci.. XLII, 
23.1. 1842. 
On the geology of the upper Mississippi. Am. Jour. Sci., XLIII, 147, 
1842. 
A new species of trilobite of very large si/.e. Report of the 1st, 2d, 
and 3d meetings of the Assoc. Am. Geol. and Nat. [1843], pp. 221-224. 
[Note. — This trilobite is the same as described in the Ohio report for 
1838, and in the Am. Jour. Sci., 1842, but the name is here changed to 
l80telU8 lilt i/istns.] 
Ancient Earthworks of Ohio. Rep. 1st, 2d, and 3d meetings, Assoc. 
Am. Geol. and Nat. [1843], pp. 229-238. 
