A correspondent of the Ohio Farmer reports an experiment in curing clover, showing how he just missed breeding fire in his barn, and illustrating the importance of ventilating hay mows:

In 1861 I used a horse fork for the first time. The haying season was not a bright one, and our clover was drawn a little greener than usual, and went into the mow in large and compact forkfuls. The result was intense heating, and consequently very rapid evaporation and sweating of the mow. On a bay holding ordinarily twenty tons we put at least thirty tons, as every load at the top seemed to make room for another. The barn was rather open, which allowed quite free evaporation on all sides as well as at the top. The result was that I had very bright and excellent hay at the bottom, top, and sides of that mow, but severals tons in the center were as completely charred as though burned in a coal pit. What prevented combustion has always been a mystery to me. Since that escape from a conflagration, I have not deemed it prudent to put clover in so green as to cause intense heating, or to fill a mow too rapidly. If we haul six loads per day to one mow, weighing thirty hundred each, which will shrink during the sweating process to one ton each, we have three tons of water to be thrown off by evaporation.

If we continue to put on six loads per day until the mow is full, the principal part of that moisture must rise through the entire mass. To relieve the hay of moisture, I deem it best to have several places of storage, and change daily or semi-daily from one to the other, thus giving time for a share of the moisture to pass off. To facilitate this evaporation and prevent the hay from reabsorbing it and becoming musty, the best of ventilation is necessary. Ventilation above a clover mow is as necessary as it is above a sugar or fruit evaporator. If there is not open space and draught sufficient to carry away the moisture, it is returned to the mow, and mould is the inevitable result. No ordinary amount of drying will prevent hay from becoming musty if ventilation is shut off during the sweating process. If a hole is cut through the floor at the bottom of the mow near the center and under a ventilator in the roof and a barrel placed over it and drawn up as the hay is mowed in, thus leaving a hole from bottom to top, evaporation will be facilitated and the quality of the hay improved.

Salt thrown on, as the clover is put in, to the amount of two or three quarts to the ton, will make it a relish with stock.