THE AMERICAN JOURNAL 



OF 



SCIEJVCE ^JVD THE JRTS. 



CONDUCTED BY 



PROFESSOR SILLIMAN, 



OF YALE COLLEGE, 



IS PUBLISHED AT NEW-HAVEN, FOR THE EDITOR, BY 



SHERM^J^ COJVVERSE, PRIJVTER AjYD AGENT. 



It is issued in quarterly numbers, of which two make a 

 volume, stipulated to contain**at least three hundred and twen- 

 ty pages ; the six volumes, already published, have avera- 

 ged over four hundred pages, and have been very fully illus- 

 trated by engravings. 



TERMS. 



Three dollars a volume in advance. An omission to remit for a 

 new volume is of course a discontinuance. 



0:^ Term of credit to general agents, 6 months, from the publi- 

 cation of No. 1. of each volume. 



— Q«©© — 



TO CORRESPONDENTS. 



Several communications came too late for this number. 



We are requested to mention that a paper from Dr. Wm. Meade announcing 

 the discovery of Idocrase and other minerals will appear in our next. 



Communications for No. 15, to be in hand by the middle of June. 



All our correspondents, and especially Botaivists, are entreated to write 

 legibly ; every technical tvord in eitery science should be so plainly written, that 

 it cannot be misread ; and every author of a memoir, intended for pub- 

 lication, who does not write a plain hand, should cause his piece to be fairly 

 copied. 



ERRATA. 



Pa. 240, line 4 from bottom, for can, read cannot 



245, 1 top, for cammunicated read communicafai 

 302, bottom line, in a few copies, for outer, read autcur 

 330, line 14 from bottom, for 12, read 10 

 341, 17 top, for Dr. read Pro/. 



313 



