AGRICULTURE WITH CHEMISTRY, 6 1 



PHOSPHORIC ACID, AND SORELINE OR OXALIC 



ACID. 



THE origin, nature, and properties of these acids have 

 previously been so fully discussed, that any further ex- 

 planation is deemed unnecessary. 



INSECTS. 



INDEPENDENT of the various substances hitherto 

 noticed, as being contained in soils, and affording 

 their assistance in the production and nourishment of 

 plants, the innumerable tribes of inserts which abound 

 in rich soils, or soils long under cultivation, ought not 

 to be everlooked. Some of these inserts are extremely 

 noxious, whilst others are inoffensive to the vegetable 

 kingdom ; but all, when destroyed, (as will hereafter 

 directed) may be rendered serviceable in affording 

 v^f a pro- 



