. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . FiG. 105.—Culture flask. Fig. 106.—Culture flask. lised condition. We have already spoken of the ordinaryand the special test tubes, the most economical size of the former is 6 in. x | in., and of the latter 6f in. x I in. A large number of flasks of various sizes shouldalways be kept in stock. The special siphon flask(fig. 107) is often used to store serum ; but smallerpipettes can be readily made by the student and arevery use
. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . FiG. 105.—Culture flask. Fig. 106.—Culture flask. lised condition. We have already spoken of the ordinaryand the special test tubes, the most economical size of the former is 6 in. x | in., and of the latter 6f in. x I in. A large number of flasks of various sizes shouldalways be kept in stock. The special siphon flask(fig. 107) is often used to store serum ; but smallerpipettes can be readily made by the student and arevery useful. They are made of glass tubing of variousdiameters, according to the size of receptacle wanted. 442 LABORATORY WORK. Take the glass tubing and draw from it in the flame apiece about 8 in. long, not including the tapering endwhich should be 4 or 5 in. long, and break off; about oneinch in front of the tapering end, draw out the tube for2 or 3 inches, thus making a constriction. Seal the ex-tremity of the tapering end in the flame, and lightlyplug the other extremity of the tube with in the hot air steriliser, or rapidly in the flame
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