Obfervatlons and Experiments on certain Specimens 

 of Englifh and Foreign Rhubarb, being an at- 

 tempt to eftimate their comparative Virtues. By 

 Dr. Fothergill 4^2 



Obfervations and Experiments on the comparative 

 Virtues of the Roots and Seeds of Rhubarb. By 



' the fame 4^7 



Opinions on the Virtue and Quality of the Englifh 

 Rhubarbs, in a Variety of Letters, viz. 



Letter L From J. C. Lettfom, M. D. F. R. and 



A. S. 436 



' n. From Dr. Hope — 439 



IIL From Sir Alexander Dick 441 



— — IV. From Dr. Cuming 442 



V. From Meflrs. Clarke, Jacam, and Clarke 444 



VL From Mr. R. C. Sims 446 



DIRECTIONS to the BINDER. 



The Plate of Mr. Horn's Patent Sowing Machine to face page 215. 



The Plate of the Rev. Mr. Cooke's patent Drill Machine, and Hand-Hoc, 



to face p. 244. 

 The Plate of Mr. Dobfon's Model of a Barn, to face p. 335. 

 The Plate of Mr. Winlaw's Patent Mill, for feparating the Grain from 



the Ears in place of Threfliing, to face p. 371. 



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