( 'orrespondence. 323 
products (mineral and vegetable), are dealt with mainly, but in the last 
section a number of well sections and a few others are found. 
Tacked on to the geological report is a botanical one, in which Prof. 
Dodson gives lists of "Trees" (evergreens), "Oaks," "Trees and shrubs of 
minor importance," etc. These lists do not, of course, pretend to be 
complete. They show, unfortunately, quite careless proof-reading. O 
frequently masquerades as a and vice versa, and u is quite often rep- 
resented by II. Some of the mistakes are quite inexcusable. 
As very little has heretofore been written regarding Louisiana geology 
one must needs be grateful for what is now accorded. J. p. J. 
CORRESPONDENCE. 
Prof. Lesley's final report. This "final summary" of the geology 
of Pennsylvania* has, after some years, been completed, and it is a fit- 
ting conclusion of the second geological survey of Pennsylvania. It is 
largely the work of the veteran geologist, J. P. Lesley, and the world 
owes him a debt of gratitude. The citizens of the Keystone state, too, 
may well be proud of the monument he has reared for them. While 
there is no State that has not at some time or other had a geological 
survey, there are few that can boast of any summary of the knowledge 
gained by the years of research. The details of a survey are of vast 
importance to the scientific world, but it is the results that a majority 
of persons desii-e. Too often these results are so hidden away among 
the mass of details that they are totally obscured, or are, at best, inac- 
cessible. But in these volumes we have an epitome of many thousands 
of printed pages, facts garnered from many volumes and arranged in 
great part by a master hand. For, besides representing to the general 
public the work they have paid for for so many years, the volumes give 
to the scientific world the opinions of a geologist whom all must honor, on 
many subjects that are discussed in the geological world; and above all, 
it is written in a clear and charming style, far different from the too 
often dry method of the ordinary geological report. It is unfortunate 
that Prof. Lesley could not have written the whole, for a large portion 
of the last volumes is by other hands, and lacks the animated method 
of the first L800 pages. 
There are but few problems that have confronted geologists upon 
which Prof. Lesley does not touch, and they are discussed in plain "Sax- 
on English," the author preferring "l)efore and after or before and 
behind to anterior and posterior, and overlaid and underlaid to super 
irajjosed and subjacent." (p. iv.) 
The first volume opens with several chapters on general geology in 
which are discussed geological time, dimensions, sections, etc. His re- 
*A Summary Description of the Geolooy of Pennsylvania. Harrisburg, 1892- 
95, :i VOL'S, in 4, with index and atlas, pp. xix, 26;J}<, pi. Gil. 
