In short, keeping in view all the information we have been able to collect, the following seems to be the true state of the case:—The crop throughout Scotland has been a very large one, but one-half of it is affected to a greater or less degree. About a fourth or a fifth of this half crop is so slightly damaged, that the unusual amount of produce will more than compensate the injury. The remainder is certainly worse. Of this, however, a considerable proportion has been converted into starch—an expedient which was early recommended in many quarters, wisely adopted by the prudent, and may yet be extensively increased. An affected potato, unless its juices were thoroughly fermented, and decomposition commenced, will yield quite as good starch as the healthy root, and all this may be considered as saved. Potato starch or farina, when mixed with flour, makes a wholesome and palatable bread. In some districts the doubtful potatoes are given to the cattle in quantities, and are considered excellent feeding. This also is a material saving.
The spread of the complaint, or rather the appearance of its worst symptoms, seems to depend very much on the mode of management adopted after the potatoes are raised. A friend of ours in Mid-Lothian, who has paid much attention to agriculture, has saved nearly the whole of his crop, by careful attention to the dryness of the roots when heaped, by keeping these heaps small and frequently turned, and, above all, by judicious ventilation through them. A neighbouring farmer, who had an immense crop, but who did not avail him of any of these precautions, has suffered most severely.
One letter which we have received is of great importance, as it details the means by which an affected crop has been preserved. We think it our duty to make the following extract, premising that the writer is an eminent practical farmer in the south of Scotland:—"I had this year a large crop of potatoes, but my fields, like those of my neighbours, did not escape the epidemic. On its first appearance, I directed my serious attention to the means of preserving the crop. Though inclined to impute the complaint to a deeper cause than the wetness of the season, I conceived that damp would, as a matter of course, increase any tendency to decay, and I took my measures accordingly. Having raised my potatoes, I caused all the sound ones, which seemed free from spot and blemish, to be carefully picked by the hand; and, having selected a dry situation in an adjoining field, I desired them to be heaped there in quantities, none of which exceeded a couple of bolls. The method of pitting them was this:—On a dry foundation we placed a layer of potatoes, which we covered with sandy mould, though I don't doubt straw would do as well; above that, another layer, also covered; and so on, keeping the potatoes as separate from each other as possible. We then thatched and covered them over as usual with straw, leaving ventilators on the top. I have had them opened since, and there is no trace whatever of any decay, which I attribute to the above precautions, as others in the neighbourhood, whose potatoes grew in exactly similar soil, have lost great part of their crop by heaping them in huge masses. Ventilation, you may depend upon it, is a great preservative. I have, I think, arrested the complaint even in affected potatoes, by laying them out (not heaping them) on a dry floor, in a covered place where there is a strong current of air.
They are not spoiling now; and when the unsound parts are cut out, we find them quite wholesome and fit for use. I am of opinion, therefore, that by using due caution, the progress of the complaint, so far as it has gone, may in most cases be effectually checked."
We are, therefore, almost certain, that when the damaged portion is deducted from the whole amount of the crop, there still remains an ample store of good potatoes for the consumption of the whole population—that is, if the potatoes were distributed equally through the markets. This, however, cannot be done, and, therefore, there are some places where this vegetable will be dear and scarce. The farmer who has a large crop of sound potatoes, and who does not reside in an exporting part of the country, will naturally enough use his superfluity for his cattle; and this cannot be prevented. We hope, however, that the habitual thrift of our countrymen will cause them to abstain, as much as possible, from wasting their extra stock in this manner, more especially as there is abundance of other kinds of fodder. They will command a high price as an esculent, and perhaps a higher, if they are preserved for the purposes of seed. Exportation also should be carried on cautiously; but we repeat, that the general tenor of our information is so far satisfactory, that it exhibits nothing more than a partial affection of the crop in the southern districts, and the majority of those are compensated by a good provision of corn.
In addition to these statistics, obtained from many and various sources, we have been favoured with the opinion of Mr Stephens, which we now subjoin:—
The Potato Rot.
"This affection I do not regard as a disease—but simply as a rottenness in the tuber, superinduced by the combination of a low temperature with excessive moisture, during the growing season of that sort of root, when it is most liable to be affected on account of its succulent texture.[39] A friend informs me that he remembers the same kind of rottenness seizing the potato crop of the country in the late and wet season of 1799; and, as a consequence, the seed potato for the following crop fetched as high a price as 26s. the boll of 5 cwt.[40] I am inclined to believe, however, that the effects of this rot are much exaggerated. It is, in the first place, said to be poisonous; and yet pigs, to my certain knowledge, have been fed on spoiled potatoes alone, on purpose, with impunity. There is little outcry made against rot in the dry soils of Perthshire and Forfarshire, and these are the two most extensive districts from which potatoes are shipped for London. There are farmers in various parts of the country who warrant the soundness of the potatoes they supply their customers. The accounts
of the potato crop from the Highland districts are most favourable. I believe the fact will turn out to be this, that, like corn, the potatoes will not only be a good, but a great crop, in all the true potato soils—that is, in deep dry soils on a dry subsoil, whether naturally so, or made so by draining—and that in all the heavy soils, whether rich or poor, they are rotting.
A short time will put an end to all conjecture on the state of the potato crop, and afford us facts upon which we shall be able to reason and judge aright."