56. Butcher's Saw, 1879. USNM 130572; 1942. This saw is part of a set of butcher's tools (Nos. 56-67) presented to William H. Hoover by the Washington Light Infantry Corps in 1879. All the tools have a silver presentation plate on the handle and have nickel plating. A. Nittinger, Jr., of Philadelphia, made the set. Gift of N. Auth Provision Company, Washington, D. C. 57. Splitting Cleaver, 1879. USNM 130572; 1942. Butcher's tool. Gift of N. Auth Provision Company, Washington, D. C. 58. Cleaver, 1879. USNM 130572; 1942. Butcher's tool. Gift of N. Auth Provision Company, Washington, D. C. 59. Meat Axe, 1879. USNM 130572; 1942. Butcher's tool. Gift of N. Auth Provision Company, Washington, D. C. 60. Knife, 1879. USNM 130572; 1942. Butcher's knife. Gift of N. Auth Provision Company, Washington, D. C. 61. Knife, 1879. USNM 130572; 1942. Butcher's tool. Gift of N. Auth Provision Company, Washington, D. C. 62. Triangular Scraper, 1879. USNM 130572; 1942. Butcher's tool. Gift of N. Auth Provision Company, Washington, D. C. 63. Hand Meat Hook, 1879. USNM 130572; 1942. Butcher's tool. Gift of N. Auth Provision Company, Washington, D. C. 64. Meat Hooks, 1879. USNM 130572; 1942. Butcher's tool. Gift of N. Auth Provision Company, Washington, D. C. 65. Carcass Spreader, 1879. USNM 130572; 1942. Butcher's tool. Gift of N. Auth Provision Company, Washington, D. C. 66. Carcass Spreader, 1879. USNM 130572; 1942. Butcher's tool. Gift of N. Auth Provision Company, Washington, D. C. 67. Meat Pins, 1879. USNM 130572; 1942. Butcher's tools. Gift of N. Auth Provision Company, Washington, D. C. [Illustration: Figure 7.--Babcock butterfat tester, about 1895. (Catalog No. 68.)] 68. Babcock Butterfat Tester, about 1895. USNM 173353; 1946. A machine used in determining the amount of butterfat in milk or cream. The Vermont Farm Machine Company of Bellows Falls, Vermont, made the centrifuge, which mixed sulphuric acid with the milk in order to produce a reading of the amount of butterfat tested. The Brighton Farm at Patuxent River, Montgomery County, Maryland, used this machine around 1895. Stephen M. Babcock developed this tester in 1890 and released it to the public, without patent, in 1891. The device had far-reaching effects in the dairy industry, because for the first time it allowed accurate payment to farmers for the actual amount of butterfat in their milk; also, it allowed farmers to test their cows to discover which ones produced the most butterfat. Gift of Sidney S. Stabler, Hyattsville, Maryland.