The seed is frequently threshed with the ordinary threshing machine, but in many instances it is also threshed with a clover huller. The huller does the work less quickly, but probably, on the whole, more perfectly. Threshing machines, with or even without certain adjustments in the arrangement of the teeth in the cylinder and concave, and with extra screens, are now doing the work with much despatch, and with a fair measure of satisfaction. But the opinion is held by competent judges that a machine that would more completely combine the qualities of the thresher and the huller would be still more satisfactory. It is easily possible to have the crop too dry to thresh in the best condition, and care should be taken to regulate the feed in threshing so that the alfalfa will not enter the cylinder in bunches. More than 200 bushels of seed have been threshed in a day from crops which yielded abundantly. The seed should be carefully winnowed before putting it on the market. The seed crops, as would naturally be expected, vary much; crops are harvested which run all the way from 1 to 20 bushels per acre. From irrigated lands the yields are, of course, much more uniform than from unirrigated lands, since in the former the supply of moisture may be controlled. Fair to good average yields on these may be stated at from 4 to 6 bushels, good yields at from 6 to 8 bushels per acre, and specially good yields at from 10 to 12 bushels. The bushel weighs 60 pounds. Growing alfalfa seed under irrigation has frequently proved very profitable. The seed grown in such areas is larger and more attractive to the eye than that ordinarily grown in the absence of irrigation, and because of this many are lured into sowing it on unirrigated land when the former would better serve their purpose. The seed is frequently adulterated with that of yellow clover (_Medicago lupulina_), which resembles it closely, but this is more likely to be true of imported than of American grown seed. =Renewing.=--Alfalfa may be renewed and also renovated where the stand secured at the first has been insufficient, where it may have been injured from various causes, where it is being crowded with weeds, and even with useful grasses, and where the land requires enriching.