Recent Puhlications. 381 
there is an approximate agreement between the perihelia of Jupiter 
and these maxima. Those instances in which the agreement is not so 
close are supposed to be due, when not refera})le to inexact or insuffi- 
cient observation, to the greater concentration of the perihelion influ- 
ence of some of the other planets at somewhat different periods. 
In conclusion, while it is possible to point out difficulties in accept- 
ing tlio author's views, and his application of them to some of the 
facts, there is much that is original and striking in this work, and it 
can not but play an important part in ultimately bringing the science 
of astronomical physics into consistent accord with acceptable doc- 
trines of the nature and action and origin of the sun's heat. We com- 
mend the book earnestly to all students of the celestial mechanics. 
RECENT PUBLICATIONS. 
1 . State and government reports. 
A dictionary of the fossils of Pennsylvania and neighboring states 
named in the reports and catalogues of the survey. J. P. Lesley. 
.3,000 figures, mostly facsimile copies, and some new species drawn 
and described by G. B. Simpson. Harrisburg, 1889. pp. 437, and 
XXXI (of errata for vol. i.) vol. i, A to M. Second Geol. Sur. Penn. P4. 
2. Proceedings of scientific societies. 
Journal of the Elisha Mitchell Scientific St)ciety, vol. iv, Part i, 
1889 ; contains historical notes concerning the North Carolina geologi- 
cal survey. By Prof. J. A. Holmes. 
Journal of the Cincinnati Society of Natural History, vol. xii, Nos. 2 
and 3, Oct. 1889; contains Devonian plants from Ohio. J. S. Newberry. 
Fort Ancient. By Warren K. Moorhead. 
3. Papers in scientific jour naU. 
Am. Jour. Sci., Nov. No. Mathematical theories of the earth. R. S. 
Woodward. Observations on some of the trap ridges of the East 
Haven-Branford region, with a map (Plate ix). E. O. Hovey. Theory 
of the mica group. F. AV. Clarke. Probable law of densities of the 
planetary bodies. R. Hooke. Pseudomorphs of native copper after 
azuritefrom Grant county. New Mexico. W. S. Yeates. 
4. Excerpts and individual publications. 
On the San Emigdio meteorite. Geo. P. Merrill. (One plate). Proc. 
U. S. Nat.^fuseum, 1888. p. Gl. 
On aperidotite from Little Deer isle, in Penobscot bay, Maine. Geo. 
P. Merrill. (One plate). Proc. U. S. Nat. Mus. 1888. p. 191. 
Missouri; its mineral resources. G. C. Broadhead. Rep. Com. Stat. 
U. 5., for 1889. p. 451. 
The aborigines of the district of Columbia and the Lower Potomac, 
a symposium. By Otis T. Mason, W. J. McGee, Thomas Wilson, 
S. V. Proudfit, W. H. Holmes, Elmer R. Reynolds and James 
Mooney. From the American Anthropologist. Vol ii, No. 3. 1889. 
