In London, some dairymen have considerable faith in inoculation, though its effect is uncertain, and the manner of its working a mystery. The best counsel, in the premises, which can be given to the keeper of dairy stock is, to select his own animals from healthy herds, and strictly to avoid public markets. In many instances, a faithful observance of these injunctions has been sufficient to prevent the invasion of this terrible disease. [Gamgee.] The existence of this disease in the United States was not generally known until the year 1859, when Mr. Chenery, of Belmont, near Boston, Massachusetts, imported several cows from Holland, which arrived in the early part of the spring of that year. Some of the animals were sick when they arrived, but the true nature of the disease was not at that time suspected. Several of them were so bad that they were carried in trucks to Mr. Chenery's barn. Some two months passed away before the character of the disease was discovered. Upon the facts becoming known, the citizens of Massachusetts became panic-stricken, as the disease was rapidly spreading over that State. An extra session of the Legislature was speedily convened, when a Joint Special Committee was appointed, to adopt and carry out such measures as in their judgment seemed necessary for the extirpation of this monster, pleuro-pneumonia. The Committee met in the Hall of the House of Representatives, Thursday, May, 31, 1860, to receive evidence as to the contagious or infectious character of the disease, in order to determine concerning the necessity of legislative action.