CONTENTS. 



XXVIII. The effect of the season of 1816, by general Da- 

 vid Humphreys, of Connecticut, - - - - 113 



XXIX. On gypsum, by John Patterson, of Warren, Virg. 115 



XXX. Richard Peters, jun. Esq. communication to Mr. 

 Eastman, on Hotchkiss's straw cutter, - - - 118 



XXXI. Samuel Betton, M. D. communication on sugar 

 canes, - - - - - 120 



XXXII. On Tangier wheat, by William Poole, - - 122 



XXXIII. On the disease in wheat called stunt, by Thomas 

 Plater, Esq. - - - - - - 125 



XXXIV. Observations on the summer of 1816, by Samuel 



L. Mitchell, M. D. 127 



XXXV. Observations on the season, and its influence and 

 effects on vegetation, in the year 1816; beginning ivith 

 those belonging to agriculture, Sfc. by 



of East Marlborough, Chester county, Pennsylvania, - 130 



XXXVI. Periodical freshes every fourteen years in the De- 

 laware, and north-east branch of the Susquehanna ri- 

 vers, by S. Preston, 140 



XXXVII. On the importance of the navigation of the De- 

 laware and Susquehanna rivers, by the same, - - 145 



XXXVIII. Extract of a communication to the late Bernard 

 M'Mahon, of Philadelphia, deceased, on the culture, ma- 

 nagement, and uses of the Mangel Wurtzel or root of 

 scarcity, by Mr. John Lloyd, of Ireland, steward to the 

 bishop of Derry, - - - - - - -151 



XXXIX. Account of an Alderney cow, by Richard Maris, 155 

 XL. Effect of the late season, (1816,) on the growth of 



grain, grasses, and vegetables, in the neighbourhood of 

 Washington, and the country above and below it, connect- 

 ed with the navigation of the Potomac, - - - 156 

 XLI. American Ploughs. Trials of them in England, 160 

 XLII. Robert Barclay, Esq. to R. Peters, on cole seed, 



tares, Mangel Wurtzel, and trials of American ploughs, 162 

 XLIII. Account of trial of Towsleifs plough ; and culture 

 of corn, turnips, Sfc. by Abraham M. Garrigues, - 165 



