394 Proceeding. 1 ; of Philosophical Societies. [Nov. 



manner in which he thinks the particular and detailed history of 

 the elementary affections may be drawn up. A second work, 

 ■which he promises, will establish and explain, by examples 

 drawn from his practice, every thing difficult and abstract which 

 this general doctrine contains. 



AGRICULTURE AND TECHNOLOGY. 



M. Tessier ha^; presented us with the results of numerous 

 experiments which he made to compare with each other the 

 far.ua of different varieties of wheat, and the bread made from 

 them. Wheats raised in the same field, ground in the same 

 mill, baked by the same baker, and in the same oven, gave 

 loaves very different in appearance, taste, and rapidity of drying; 

 differences which may influence us in the preference given to 

 each variety. 



M. Parmcntier, who is not prevented by his great age from 

 devoting himself with the same ardour to every thing that affects 

 the prosperity of agriculture, has given a sketch of the results 

 obtained in the manufacture of syrups and conserves of grapes, 

 from the time when his treatise on the subject drew to it the 

 attention of agriculturists, and he shows all the advantages that 

 may be derived from this method, now that he has brought it to 

 perfection by experience. 



The same author has published a new edition of his Treatise 

 on the Culture of Maize, which received the prize in 1784 from 

 the Academy of Bourdeaux, and which has been of essential 

 service to the southern departments of France. 



The art of rotation of crops consists in making it produce, by 

 the succession of vegetables committed to it, and by the labour 

 which the cultivation of them requires, every thing that it is 

 capable of producing without ever injuring it. For some years 

 it has been the principal object of research with those who em- 

 ployed themselves in promoting agriculture. 



M. Yvart, correspondent, who has undertaken a great work 

 on the subject, has this year submitted to the Class An Historical 

 Notice on the Origin of Rotation of Crops {assolemen), followed 

 by an Explanation of the principal Motives and Means adopted 

 to extend il in the French Empire. This notice seems intended 

 as an introduction to his great work. The researches of the 

 author have shown him that the triennial rotation so common in 

 .Europe at present is a modern invention. This rotation, which 

 consecrates the third year to the repose of the soil, has been 

 introduced by laziness and poverty, and perpetuated by custom 

 and ignorance. In the historical notice of Yvart, we see that all 

 good farmers, both ancient and modern, of every country, have 

 ascertained that the true repose of the soil consists in varying 

 productions. Virgil has consecrated this precept: — 



" Sic quoque mutatis requii&cunt fcotibus arva."— Ueokg. Lib. I. 



