Q. How many years did Mr. Anderson's windmill pump continue in operation!

A.. About four years.

Q How frequently did it fail to operate from getting out of order?

A. It was seldom out of order - no more than a common pump.

Q. How many days, during the summer and autumn, did it fail to furnish a supply of water for his cattle, from a want of wind to keep the mill in operation?

Q. Did it often suffer injury from violent gales of wind! A. Never, at any time.

Q. Was it, on the whole, considered a successful, cheap, and reliable plan for watering a stock of cattle? A. It was.

The above letter of Dr. C, and the answers of Mr. A., will suffice to put to rest the article which appeared in the Cultivator. It would be needless, in Ohio, to add that the statements of these two gentlemen do not admit of a doubt I will only add that, of the numerous letters which I hace received in regard to the machine, since the description of it appeared in the Horticulturist, nine-tenths of them have contained suggestions for improving and complicating the plan. Its simplicity is the surety for its success. Every proposed change would either increase the friction or the power, - the one would render a stronger wind necessary to set it in operation, while the other would result in racking the machinery.

Several have been constructed, and failed because the cranks had too much sweep, and the wheels were too large. The flange on the axle should be only an inch and a half long, allowing a play of three inches; and the diameter of the wheel should not exceed four feet I would in no point vary it from the plan figured and described in my first article.

The present season has shown the want of such a machine on the premises of almost every individual who owns an acre of ground in our country, and it is a matter of surprize that our ingenious mechanics do not supply what the public stand ready to purchase.