Recent Publications. 249 
A chapter is devoted to "potential energy," or that stored-up force 
which .some i)hysicists have dressed up in mathematical formula;, 
ready to act when the proper circumstances arise. If there be such 
energy in the universe it will profoundly affect the calculations of the 
author, which are based on the sole and comiirehensive source repre- 
sented bj' primal heat. He shows that all instances of what is styled 
potential energy are resolvaljle into kinetic force, ami that really 
potential energy is a myth, an<l can play no part in a rational theory 
of solar heat. 
Under the definition of energy as matter in motion, and in compliance 
with the law of conservation of force, "energy is generated nowliere, 
it is lost nowhere, it is confined to no place, it travels endlessly from 
world to world and from sun to suu, it never tires, it never rests, it 
never begins, it never ends, it never increases, it never grows less. It 
is at once the symbol of omnipotence and of eternity. The universe 
can never, never, never run down." The dissipation of energy is 
therefore true only in the sense that energy may be difi'used, and may 
take on other forms. 
[to be CONTINUEn.] 
RECENT PUBLICATIONS. 
1. State and Government reports. 
Geological survey of Arkansas, Annual report for 1SS8^ vol. ii. The 
Neozoic geology of southwestern Arkansas, by Robt. T. Hill, with 
appendices, The northern limits of the Mesozoic rocks in Arkansas, 
by O. P. Hay, and On the manufacture of Portland cement, by John C. 
Branner. 
2. Proceedings of Scientific societies. 
BuUefi)i of the Proceedings of the Colorado Scientific Society, vol. iii. 
Parti, 1888, contains the following geological papers: Preliminary 
notes on the Eruptions of the Spanish peaks region (with map) by R. C. 
Hills; Colorado Volcanic Craters, by P. H. VanDiest; Notes ou some 
unusual Occurrences of Galena Crystals, by F. F. Chisolm; Mineral- 
ogical Notes, by AV. F. Ilillebrand ; The Quaternary of the Denver 
Basin, by Geo. L. Cannon Jr. ; The Genesis of Ore Deposits, by Rich- 
ard Pearce. Two Sulphantimonites from Colorado, by L. G. Eakins ; 
Notes on the Ore occurrence of the Red Mountain district, by T. E. 
Schwarz ; On some Stratigraphical and Structural Features of the 
country about Denver, Colorado, bj' Geo. H. Eldridge ; The Denver 
Tertiary Formation, by Whitman Cross ; On the Tertiary Dinosauria 
found in Denver Beds, Geo. L. Cannon Jr. ; The recently discovered 
Tertiary P.eds of the Huerfano River basin, Colorado, (with map) by 
R. O. Hills; The field for original Work in the Rocky mountains, by 
Pres. R. C. Hills. 
4. Excerpts and individual publications . 
Bulletins of the AVashburn college Laboratory of Natural History, 
Topeka, Kansas, 1884-1889 contain the following geological papers : 
