text:  But after a most judicious recommendation to observe and _record_ whatever occurs either new or interesting in his field of labour--without which record he will not be able to contribute as he may hereafter do to the extension of agricultural knowledge--he is taught next in an able chapter "upon soils and sub-soils " to study the nature of his farm more thoroughly; to ascertain its natural capabilities--the improvements of which it is susceptible--the simplest most efficacious and most economical means by which this improvement may be effected--and the kind of implements which it will be most prudent in him to purchase for tilling the kind of land of which his farm consists or for bringing it into a more fertile condition