286 On Liming Land. 
tioned any thing new to experienced farmers, or others 
acquainted with the subject, I have, at least, endea- 
voured to set an example; so as to invite their com- 
municating what they know to be instructive. Putting 
a subject i requisition, always rouses attention; and 
draws forth useful facts ; and discussion conveying in- 
struction, which would otherwise remain hidden, or 
confined to the knowledge of a few individuals. What 
may be familiar to experienced agriculturists, is never- 
theless highly’ acceptable, and essentially instructive, to 
those who want practical knowledge. 
RicHARD PETERs. 
2d July 1810. 
To the Philadelphia Society for promoting Agriculture. 
able, as we find it in fact, that there is no hostility. It is most 
probable, that the sulphuric acid of the gyps, being the strong- 
est, while the carbonic is the weakest, expels it,—sets it free 
ta act on the plant,—and repels farther supplies of fixed air 
taking possession of the lime. 
As to the poit—whether the lime we commonly use is 
or is not of the magnesian species, it yet depends on more 
extensive examinations than have, in this early stage of inqui- 
ty, been made, before a decisive opinion can be formed. So 
far as the experiment Mr. Lang mentions reaches, the proof 
appears strong. And if specimens of the limestone in other 
quarters produce, when analyzed, the like results, the poimt 
will be indisputably decided. 
R. “Ps 
September 17th, 1810. 
* 
See hereafter Mr. Lang’s communication. 
