302 Miscellaneous Intelligence. 
of apparatus, geology and palwontology, the earth’s magnetism, and the 
invention of the Electro-chronograph, which he claimed the honor ie 2255 
against one or two rivals. On the subject of the earth’s magnetism he = 
extended much our knowledge, by his explorations over the regions of the 
Northern Mississippi and Lake Superior. As a writer in Cincinnati ob- 
rves, “he was an ardent student, a profound scholar, an indefatigable 
gist. 224 pp.12mo, Philadelphia, 1856. - 
The scope of this work is hardly indicated in the title. It does nob = 
ns, especially in Pennsylvania. Neither is it restricted to the su 
ject of Coal, but enters freely into the general topics of mountain struc- 
tures and forms, the origin of mountains, formation of valleys, theory of 
drift, topographical drawing, and directions to geological and topogra } 
ical surveyors, yet mainly from an Appalachian point of view. [he 
author was formerly an assistant in the Geological survey of Pennsylva- 
nia, under Prof. H. D. Rogers. e has been an attentive observer, em- 
and Andrew A. Henderson, who were once assistants in the Pennsylvania 
Geological survey. : 
The point in the volume that will excite most remark, is the claim ad- 
vanced in behalf of Mr. Whelpley and Mr. Henderson, of having first 
i . rs 
nection with the subject. “ Years of patient toil,” he says, “it cost us to 
unfold the mysteries of the Pennsylvanian and Virginian range,” including 
the superintendent in a Geological survey. ee 
. A Treatise on Land Surveying ; comprising the Theory developed 
from Five Elementary Principles, and the Practice with the Chain alone; 
the Compass, the Transit, the Theodolite, the Plane-table, ete. Il 
