Thanks for your letter. What you say of the preparation is no doubt perfectly correct; but were we to insert it, it would be looked upon as an advertisement, and we cannot afford to advertise gratis. If the specific you write so highly of had been at any time advertised in our columns, we should have felt no difficulty in publishing your letter; but as the case stands, we should be doing those who advertise with us great injustice were we to insert such letters as yours, well meant as it no doubt is.