169 



Sitzungsberichte der K. Akad. der Wissenschaften zu Wien: — Math. 

 Nat. Classe, XV. Band, 3 Heft. XVI. Band, 1 Heft.— Phil. Hist. 

 Classe, XV. Band, 2, 3 Heft; XVI. Band, 1 Heft. Wien. 1855. 

 8vo. — From the Imperial Academy of Sciences, Vienna, 



Monthly Notices of the Royal Astronomical Society. Vol. XV. No. 

 2. London. 8vo. — From the Society, 



Proceedings of the Boston Society of Natural History. Vol. V. No. 

 17. Boston. 8vo. — From the Society. 



ProceedincTs of the New Jersey Historical Society. Vol. VII. No. 4. 

 Newark. 8vo. — From the Society. 



The African Repository. Vol. XXXI. No. 1. Jan. 1856. Washing- 

 ton. 8vo. — From the American Colonization Society. 



The American Journal of Science and Arts. Second Series. Vol. 

 XXI. No. 61. Jan. 1856. New Haven. Svo.— From Profs. 

 Silliman 6^ Dana, Editors. 



Report of the Superintendent of the Coast Survey, showing the pro- 

 gress of the Survey during the year 1854. Washington. Svo. — 

 From A. D. Bache, Superintendent. 



The Right Use of History: An Anniversary Discourse delivered be- 

 fore the Historical Society of Pennsylvania. By William Parker 

 Foulke, of Philadelphia. Philadelphia, 1856. 8vo. — From the 

 Historical Society of Pennsylvania. 



Jewelry and the Precious Stones: with a History and Description 

 from IModels of the largest individual Diamonds known : including, 

 particularly, a consideration of the Koh-i-noor's claim to notorie- 

 ty. By Hipponax Roset. Philadelphia, 1856. Svo. — From Jo- 

 seph R. Paxton, Esq. 



The Astronomical Journal. Vol. V. No. 18. Cambridge. 4to. — 

 From Dr. B. A. Gould, jr., Editor. 



The Rev. Dr. Rogers read a communication, illustrated by 

 a model and diagrams, on an improvement in the construction 

 of the ordinary carpenters' square, rendering it practically 

 applicable to uses for which, in its present form, it is not cal- 

 culated. 



The attention of the members of the Society is respectfully request- 

 ed to a model of an improvement on the common square used by me- 

 chanics, which it is thought is possessed of some peculiar advantages. 

 It consists of a moveable limb, attached to the common square, with 

 corresponding graduations. This limb is so arranged that the square 



