CONTENTS. Vll 



ASTRONOMY AND MECHANICAL SCIENCE. 



Page. 



1, 2. Biela's comet— Observatory of Geneva, - - 390 



3, 4, 5. Medal for discovery of Comets — Maximum density of 



water — On the simultaneous motions of a pendulum and 



the surrounding air, _--_-_ 391 



AGRICULTURE AND DOMESTIC ECONOMY. 



1. On the cultivation of beets and the manufactory of sugar, 392 



2. Relative values of different kinds of food for sheep, - 393 



DOMESTIC. 



1. Professor Jacob Green's Monograph of the Trilobites of 



North America, with colored models of the species, 395 



2. The Herbarium of the late Zaccheus Collins of Philadelphia, 398 



3. The coal beds of Pennsylvania equivalent to the great secon- 



dary coal measures of Europe, - - - - 399 



4. Correction of an error in Prof Green's Monograph of North 



American Trilobites ; with additional explanations, 400 



5. Caution addressed to manufacturers and venders of inflamma- 



ble substances, especially if volatile, . - _ 401 



6. The Cabinet of Natural History and American Rural Sports, 



with illustrations, - - - - - - 402 



7. 8. Manufacture of Telescopes, &c. — Phosphate of Lime in 



Edenville, N. Y., - - - - - - 403 



9. Geological Map, - - - - - - - 404 



10, 11, 12. Fossil Shells of the Tertiary Formations of the Uni- 



ted States — Anthracite in Wrentham, Mass.^ — Comparison 

 of weights and measures of length and capacity, reported 

 to the Senate of the United States by the Treasury De- 

 partment in 1832, .._._- 405 

 13. Revised editions of Spurzheim's Works, - _ . 406 



