We give below a paragraph from the Scientific American because it is important to the cultivator of the soil to know what is going on in these things. We give it rather as in the nature of a warning, than an endorsement, for all experiments to get value out of these articles have failed. It seems that to be beneficial they must first have first entered into the structure of a plant or an animal. There is no more common element in natural soils than potash. It is a component of feldspar that goes to make up a large portion of soil on granite foundations. Yet there are no poorer soils than these, unless heavily manured. But wood ashes, or the potash that is obtained from vegetable matter is often very valuable for fertilizing. So we know that the phosphate of lime derived from bones, or the tertiary shell formations of Charleston, or the rotten shells in the sands of New Jersey, is wholesome food for plants, - but we very much doubt whether phosphate of lime derived from limestone and phosphoric acid would amount to much. If this were so, we might have a phosphate factory near every limekiln.

We should hesitate before paying $20 a ton for phosphatic slag, however many "able scientists" backed it up.

'•The slag from the Thomas-Gilchrist process for making steel has long been supposed to have valuable properties as a manure. In the Bessemer converter, there is a lining of lime which, in the process of manufacturing the steel, takes up a large percentage of phosphorus, in the form of phosphoric acid. Phosphate of lime has been used as an artificial manure, in a variety of forms, with very beneficial results on most lands. It was thought that the basic cinder obtained in the Thomas-Gilchrist process might, from its large percentage of lime and phosphoric acid, have a manurial value.

" Some two or three years ago, experiments in this direction were undertaken in Germany by M. Fleisher and others, and from the data which they obtained, it appeared that under certain conditions basic slag had a very marked influence upon crops grown on soils which had been top-dressed with it. It was ground into a very fine powder, and then the acids of the soil were able to dissolve the phosphoric acid which it contained; and it was then in a condition to be readily assimilated by plants. Attention is again being called to this point in consequence of a series of similar experiments which have been carried out by Dr. Munro, at Downton, for the North Eastern Steel Company, and which fully confirm the earlier experiments of the German investigators. It was thought that probably the slag would be more efficacious if it were first convened into a "superphosphate," in a similar manner to bones; but Dr. Munro and Mr. Wrightson seem to think that this is unnecessary, if care be taken to have the basic cinder in as pure a state of division as possible.

"As basic slag is a waste product, and hitherto has had no industrial application, it ought to be obtainable at a much cheaper rate than the Canadian apatite, coprolites, and bone manures, which have until recently been the chief artificial fertilizers used in agriculture. Dr. Griffiths has recently, in papers read before the Chemical Society of London, advocated the use of iron sulphate as a manure, and as basic slag contains a considerable quantity of iron in the same condition of oxidation as in ferrous sulphate, it may also have some effect upon the manurial value of the Thomas-Gilchrist slag".