Document BxRx8xeMo7zdyrQppm3V5V7j

high (loath ratt* is that both were' rich in corn products and ; low in wheat by-products. Corn is known to be poor in protein particularly, because it lacks some essential amino acids, such as tryptophane. Dr. L. Emmett # Holt, Jr., of Baltimore, in an . address to a scientific meeting ; in the spring of 1944, described f the ill-effects in human beings % caused by the lack of trypto phane in the diet, which in cluded baldness, defective \ teeth, and female reproductive failure. In view of the fact, * however, that the defective ration supplemented with poulO try offal and other protein supplements was still found to be inadequate, it is the opinion of ? the Raritan workers that the / deficiency is probably not due r;.f to the quality or quantity of C the protein. This new and somewhat in> > cidental discovery of the dif ferences in performance of liver extract indicates in striking . fashion the need for new meth ods of assaying the potency of such biologic materials used in medical treatment, and possibly the need for closer attention to the feeding and care of all animals from which by-prod ucts used for therapeutic pur poses are derived. (At present such products are among the numerous important by-prod ucts of the meat-packing in dustry.) The finding also serves to reinforce more strongly the fre quently repeated thesis that dog food must be assayed bio logically, to evaluate its feed ing value, for chemical analyses give information only as to what nutrients are contained in any given food, and do not measure true nutritive value at all. Two Foods Approved There are two dry dog foods that currently meet the ap proval of the Committee on Foods of the A.Y.M.A. and A.A.H.A. for acceptable ra tions. These are: Friskics (Albers Milling Co., Seattle. Wash.) 25c per 2-lb. package (13c per lb.). Gro-Pup (Kellogg Co.. Battle Creek, Mich.) 22c per 25-oz. package (14c per lb.). In the past there have been a number of brands on the list approved by the Committee on Foods of the American Veter inary Medical and Animal Hos pital Associations, but wartime shortages of many important ingredients have reduced the nutritive values of some of these. Dry dog food, if properly pre pared from the right ingredi ents, provides the cheapest way to feed a dog adequately, since the purchaser can easily supply the liquid with which it is to be mixed, instead of paying for it at the grocery store and carry ing it home in cans--as in pre war days. Broth from vege tables cooked for the table and a little fat, preferably rendered from meat scraps or other ani mal material, mixed with the dry ration will provide a palat able and economical mixture for feeding of dogs and cats. A Paint for Glass-Frosting Sapolin, a ``glass frosting" material selling at 40c a half pint. intended to be used for giving a window a coating which will transmit light but prevent those outside from seeing in, was found on analysis to con sist of petroleum naphi a, some resin and oil, and a pigment consisting of a mineral similar to clay. The material is thus apparently a grayish yellow enamel of low pigment content so that its hiding power is low and the resulting film is trans lucent rather than opaque. Of the two samples of Sapolin tested, the directions of one called for tapping the finish be fore it had set, with a lint-free cloth, to produce a stippled ef fect. This had the advantage of eliminating the brush marks and producing a somewhat more opaque, and better appearing finish than was secured by fol lowing the directions on the other can, which omitted men tion of this operation. Both samples produced a frosted fin ish that was judged satisfac tory for obscuring vision, as would be desirable on windows or glass door panels of bath rooms, etc. CONSUMERS' RESEARCH BULLETIN JANUARY, 1945 17