till it runs clear. But there is a method of preventing impurities in spring-water, that will be always effectual: just around on the upper side of the spring make a tight fence two feet high, and it will turn aside, and cause to run around the spring, all the water that may flow down the rise above in time of rains. The house being near the head, there will not water enough get into the spring, in any storm, to roil the water. On the side of the boxes where the water escapes should be wire-cloth, so fine as not to allow the eggs to pass through. Such an apparatus will be perfect. This great care is only necessary for trout. All other fish worthy of cultivation, will only need spawning-beds on the margin of their pond. A convenient hatching apparatus is a number of wicker-baskets, fine enough not to allow the eggs to pass through, set in a flume of clear running water. The method of Gehen and Remy, the great fish-cultivators of France, whose efforts and discoveries have contributed more to this science than those of any, if not of all other men, was to place the eggs in zinc-boxes of about one foot in diameter, having a lid over them--the top and sides of the boxes pierced with small holes, smooth on the inside; these boxes were partly filled with clean sand and gravel, and set in clear running water. M. Costa's method, at the college of France, is to arrange boxes in the form of steps, the top one being supplied with water by a fountain, and that passing from one to the other through all the series, and the eggs placed on willow-hurdles instead of gravel.