I have also used guano and charcoal dust, five parts coal to one of guano, in my garden, the past season, and found the beds thus dressed stood the extreme drought better than other parts of the garden. One more case of my own and I am done. In 1851, I sowed about 90 lbs. of guano, on a piece of meadow or mowing ground, covering a little more than half an acre, from which the timothy and clover was nearly gone; I took 3 lands across the lot, leaving about 20 feet between each land. Where the guano was sown, the timothy grew large and thick and bore the drought, and yielded about one and a half tons per acre; while the rest of the field did not produce more than half that amount, and that of an inferior quality of grass. The corn upon the same field the present season, shows plainly a better yield from the above top-dressing. From observation and experience, I would recommend the mixing of guano with charcoal dust, equal parts, or five parts coal to one guano, It is much more pleasant to handle when thus mixed, being completely deodorized and rendered much more enduring as a manure, by retaining the ammonia for several years, instead of allowing the greater part to pass off the first season, as is the case when applied in a crude state, especially as a top dressing. Prepared or decomposed muck if used with guano as a retainer of the volatile gases, in all cases where it can be conveniently obtained especially in soils where evaporation is so rapid as it is in most parts of Long Island, will pay. That like produces like, is a favorite maxim with me--that it is necessary to replace the matter, both organic and inorganic, which we take from the soil in the form of crops, of various kinds--that by supplying the necessary chemical ingredients, we shall be able to draw a great proportion of our crops from atmospheric agents--that the necessity for using such an immense amount of organic matter as we now use in the shape of barn yard and stable manure will be partially overcome--that a great saving of expense will thereby ensue--that guano is one of the most active agents to effect such a result I am fully satisfied, not sufficient perhaps of itself, but highly useful even in a crude state--and capable when skillfully combined with others, to effect an entire revolution in our system of agriculture. If you think the above worth an insertion in the pamphlet you spoke of, you are at liberty to insert it--if not, you will please return the letter to me, as soon as convenient, and if you think it will pass off any better, you may affix the following signature to the communication. EDWARD H. SEAMAN, Recording Secretary, Queen's Co. Agricultural Society.