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. JYew Theoretical and Practical Treatise on JVavigation, by 

 M. F. Maury, Passed Midshipman, U. S. JV. 8vo. pp. 216, and 

 174 of tables, 9 plates. Key 8i 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 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- 

 prehensive manner ; and also imparts much important instruction on 

 the variation 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, Sic. ; Proportional 

 Logarithms; Latitude and Departure; Meridional Parts; Ampli- 

 tudes ; Atmospherical Refractions, he. 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 John Gummere, A. M. Se- 

 cond edition, enlarged and improved. Philadelphia, 1837. 



We are glad to see Gummere's Astronomy presented to ihe 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, 



