Set out at four this morning for Redbourn, and then turned off to the Westward to go to High Wycombe, through Hempstead and Chesham. The _wheat_ is good all the way. The barley and oats good enough till I came to Hempstead. But the land along here is very fine: a red tenacious flinty loam upon a bed of chalk at a yard or two beneath, which, in my opinion, is the very best _corn land_ that we have in England. The fields here, like those in the rich parts of Devonshire, will bear perpetual grass. Any of them will become upland meadows. The land is, in short, excellent, and it is a real corn-country. The _trees_, from Redbourn to Hempstead are very fine; oaks, ashes, and beeches. Some of the finest of each sort, and the very finest ashes I ever saw in my life. They are in great numbers, and make the fields look most beautiful. No villanous things of the _fir-tribe_ offend the eye here. The custom is in this part of Hertfordshire (and I am told it continues into Bedfordshire) to leave a _border_ round the ploughed part of the fields to bear grass and to make hay from, so that, the grass being now made into hay, every corn field has a closely mowed grass walk about ten feet wide all round it, between the corn and the hedge. This is most beautiful! The hedges are now full of the shepherd's rose, honeysuckles, and all sorts of wild flowers; so that you are upon a grass walk, with this most beautiful of all flower gardens and shrubberies on your one hand, and with the corn on the other. And thus you go from field to field (on foot or on horseback), the sort of corn, the sort of underwood and timber, the shape and size of the fields, the height of the hedge-rows, the height of the trees, all continually varying. Talk of _pleasure-grounds_ indeed! What, that man ever invented, under the name of pleasure-grounds, can equal these fields in Hertfordshire?--This is a profitable system too; for the ground under hedges bears little corn, and it bears very good grass. Something, however, depends on the nature of the soil: for it is not all land that will bear grass, fit for hay, perpetually; and, when the land will not do that, these headlands would only be a harbour for weeds and couch-grass, the seeds of which would fill the fields with their mischievous race.--Mr. TULL has observed upon the great use of headlands.--It is curious enough, that these headlands cease soon after you get into Buckinghamshire. At first you see now-and-then a field _without_ a grass headland; then it comes to now-and-then a field _with_ one; and, at the end of five or six miles, they wholly cease. Hempstead is a very pretty town, with beautiful environs, and there is a canal that comes near it, and that goes on to London. It lies at the foot of a hill. It is clean, substantially built, and a very pretty place altogether. Between Hempstead and Chesham the land is not so good. I came into Buckinghamshire before I got into the latter place. Passed over two commons.