208 Miscellanies. 
ing it. The skull of any native tribe, if sufficiently perfect to figure, 
will be highly prized ; and, where practicable, several individuals of 
the same tribe will serve an important purpose for comparison. The 
latter object will also be more or less subserved by the skulls of any 
of the races, more especially those of the Mongolian and Malay, as 
approaching nearest to the American. 
22. New Theoretical and Practical Treatise on Navigation, by 
M. F. Maury, Passed Midshipman, U. S. N.  8vo. pp. 216, and 
174 of tables, 9 plates. Key & Biddle, Philadelphia, 1836.—The 
author of this Treatise, is already favorably known to the public for his 
contributions to science, and the work before us amply sustains his 
character as an officer well grounded i in the varied learning demand- 
ed in his profession. The work is appropriately introduced with 
chapters on Algebra, Geometry, Logarithms, Plane and Spherical 
Trigonometry, which contain whatever knowledge of these topics is 
deemed essential to a thorough understanding of the theory of navi- 
gation. The section on Nautical Astronomy and Practical Naviga- 
tion; which next follows, unfolds these subjects in a logical and com- 
sive manner ; and also imparts much important instruction on 
the warianion of the Compass, the Tides, and on the mode of con- 
ducting triangulating surveys. Appended to the work, are tables of 
Logarithms of Numbers; of Sines, Tangents, &c.; Proportional 
Logarithms ; Latitude and Departure ; Meridional Parts; Ampli- 
tudes ; Atmospherical Refractions, &c. The style of the. treatise 
deserves much praise; it unites fullness of statement with brevity 
and precision. The estimation in which the work is held among 
those best qualified to appreciate its worth, may be inferred from the 
fact that a copy has been ordered to be placed on board all our na- 
tional vessels. It cannot fail to be of important service to the inter- 
ests of nautical science. 
23. Gummere’s Astronomy.—An Elementary Treatise on As- 
tronomy—in two parts—the first containing the Theory, the second 
Practical Problems—with an Appendix comprising Solar, Lunar, 
and other Astronomical Tables. By Joun Gummere, A.M. 5S 
cond edition, enlarged and improved. Philadelphia, 1837. 
We are glad to see Gummere’s Astronomy presented to the public 
in a new and improved form. It is a valuable work, evincing a good 
acquaintance with the subject of which it treats, and comprising, 
