Our practical experience in these matters is so limited, that we feel diffident in adding any thing to these remarks of Mr Stephens. We may, however, be permitted to express a doubt whether the average quality of the crop has yet been satisfactorily ascertained. It is well known that the farmer rarely brings his best wheat into the earliest market, because it is his interest to thrash out that part of the crop which may have sustained a partial damage, as soon as possible; and in these circumstances it usually follows, that the worst wheat is first exposed for sale. In like manner he wishes to dispose of his inferior barley first. In regard to oats, the inferior portions find consumption at home by the horses. In ordinary seasons, any wheat or barley that may have shown symptoms of heating in the stacks are first presented at market; but in this season, when there is no heated grain--thanks to the low temperature and the precautions used in stacking--the high prices have tempted the farmers to thrash both wheat and barley earlier than usual, in order to meet the demands for rent and wages at Martinmas--a term which, owing to the lateness of the season, followed close on the termination of the harvest. This peculiarity of the season may, perhaps, account for the large supplies of wheat presented for some weeks past at Mark Lane--to the extent, we understand, of from 30,000 to 40,000 quarters more than last year at the same period. It is more than probable that the largest proportion of the land in fallow has been sown with old wheat, as it was early ascertained that the harvest would be unusually late. There is always more bare fallow in England than in Scotland, and the old wheat having been thus disposed of, the earlier portion of the new grain was brought to market, and not appropriated for its usual purpose. We must, however, conclude, that the crop--at all events the wheat--is inferior to that of former years. This has generally been attributed to the wetness of the season, in which view our correspondent does not altogether concur; and we are glad to observe that on one important matter--namely, the fitness of this year's grain for seed--his opinions are decidedly favourable. CAUSE OF INFERIOR QUALITY OF WHEAT.