CONTENTS. 



Page. 



XXX. Herbage and shrubs spontaneously produced^ 

 qftei- forest timber burnt, by firing the woods ^ by 



the same, - - - - - 237 



XXXI. On trench ploughing, by the same, - 240 



XXXII. Hemlock, fi)r live fences, by the same, 249 



XXXIII. Utility of the Italian mulberry tree, and 



on making wine, by Joseph Cooper, - - 252 



XXXIV. On a three furrow plough, by JFiUiam 

 Bakewell, of Montgomery County, - - 257 



XXXV. On speltz, by James Mease, M. D. 260 



XXXVI. On draining, by Samuel Dickey. Com- 

 municated to John Miller, ajid by him to the So- 

 ciety, - - - - - 262 



XXXVII. Observations on making and fining cyder, 

 and on peach trees, by Timothy Matlack, Esq. 268 



XXXVIII. Postscript to Mr. Taylor'' s memoir on 

 live fences, - - ... 280 



XXXIX. Remarks on the plan of a stercorary, de- 

 scribed in the note, page 153, by Richar'd Peters, 281 



XL. Account of native thorns, by Thomas Main, 286 



XLI. Growth of thorns, from cuttings of the roots, 

 by James Mease, M. D. - - - - 288 



XLII. Description of a kitchen stove, by Samuel 

 Dickey. Communicated to John Miller for the 

 Society, - - - - -£91 



XLIII. Changes of tnnber and plants. Races of 

 ariimals extinct, by Richard Peters. Connnuni- 

 cating letters o?i tJie subject: from Mr. Rembrandt 

 Peak, Charles Caldwell, M. D. and Thomas F. 

 Leaming, Esq, - - - - 296 



XLIV. Gypsum; whether it is found in the United 

 States, by the same, - - - - - 310 



