on the Geology of New Hampshire. 35 
- Warren.—Valuable ores of copper and zinc exist in this town, 
the former of which have been wrought to some extent. The 
copper ore is mostly pyrites, the zinc ore is the black blende, and 
associated with them in some veins are tremolite, iron pyrites and 
rutile. 
Before passing from the account of field operations, we may 
remark that several lithographic prints of some of the most inter- 
esting views in thé State adorn its pages. These are “ Dixville 
Notch,” “‘ Lake Winnipisseogee,” “ Flume at Franconia,” “ Slide 
at the Willey house” and ‘Monadnock Mountain.” 'There are 
also several wood engravings of other scenery and of appearances 
presented by the strata in many places. ‘The lithographic views 
are from sketches made by Mr. J. D. Whitney, Jr., and were drawn 
on stone by Mr. Charles Cook of Boston. 
A considerable portion of the work is devoted to ‘‘ economical 
geology,” so called, and to “‘agricultural geology and chemistry.” 
In these departments, perhaps it may be said without disparage- 
ment to others, that among those of our countrymen who have 
treated upon them, our author is of the highest authority. His 
thorough knowledge of analytical chemistry, and his acquaint- 
ance with the application of this knowledge to the arts, must 
make his observations of great service to such of those interested 
in the working of metals and other minerals, as also of those en- 
gaged in agriculture, who choose to take advantage of them. 
Economical Geology. 
Under this heading a description is given of the various min- 
eral substances found in New Hampshire, that are or may be ser- 
viceable in the arts. We state them as follows :— 
Granite, Syenite, Gneiss, Mica Slate, Talcose rock or Soap- 
stone, Granular Quartz, Milk Quartz and Limestone, the uses 
of which are well known. 
Novaculite, of which oil stones and hones are made. 
Mica, used for lanterns, windows, &c. 
Infusorial silica, serviceable as polishing powder, &c. 
Moulding sand, for moulding purposes and making Bristol brick. 
Clay, used for brick-making and pottery. 
Calcareous Marl, for agricultural purposes. 
Black Lead or Graphite, for pencils and founder’s pots. 
Of precious stones, such as are used in jewelry, there are 
found— 
