* • • 



VII! CONTENTS 



3. Note to remarks on the Guaco, 



4. Optics, - 



Page. 

 388 



389 



390 



5. Note on certain experiments on the inflammation of phospho- 



rus in a rarefied medium, 



6. On the growth of timber, by A. C. Twining, - - 391 



7. Barometer, 393 



8. Propositions, stated by Isaac Orr, - - - - 395 



9. Prof. Hitchcock's Report on the Geology of Massachusetts, 396 



10. Manual of Mineralogy and Geology, by Ebenezer Emmons, 



M.D. 



397 



11. Manual of Botany for North America, by Prof. Amos Eaton, 398 



12. Botany of the Northern and Middle States, by Lewis C. Beck, 398 



13. Notice of text-books of Rensselaer School, - 399 



ERRATA. 



Page 26, 1. 14 fr. bot. for survey, or, read surveyor; p. 27, 1. 3 fr. bot. omit always; 

 p. 237, 1. 2 fr. top, erase ana, and insert a , after abandoned ; p. 246, 1. 2 fr. top, 

 for 1831, read 1832; p. 258, 1. 8 from top, for ornamental, read ornamented. 



The Nos. of the Arts. X and XI, in the first No., are repeated both in the con- 

 tents and text, and all the Nos. that follow are, therefore, wrong. 



Vol. xxiii, p. 404, 1. 7 fr. bot. for Morriss river, read Moosup river. 



