. A text-book of bacteriology, including the etiology and prevention of infective diseases and a short account of yeasts, and moulds, haematazoa, and psorosperms. Bacteriology. 624 APPENDICES. (G) Apparatus and Material for Preparing and Storing Nutrient Gelatine and Nutrient Agar-agar. Water-bath.— A water-bath on tripod stand is required for boiling the ingredients of nutrient jellies and for general purposes. The lid may be conveniently composed of a series of concentric rings, so that the mouth of the vessel may be graduated to any size required. Test-tube Water-bath.—This consists of a ci
. A text-book of bacteriology, including the etiology and prevention of infective diseases and a short account of yeasts, and moulds, haematazoa, and psorosperms. Bacteriology. 624 APPENDICES. (G) Apparatus and Material for Preparing and Storing Nutrient Gelatine and Nutrient Agar-agar. Water-bath.— A water-bath on tripod stand is required for boiling the ingredients of nutrient jellies and for general purposes. The lid may be conveniently composed of a series of concentric rings, so that the mouth of the vessel may be graduated to any size required. Test-tube Water-bath.—This consists of a circular rack for test-tubes within a water-bath. It is sometimes employed instead of the steam cylinder for sterilising nutrient jelly in tubes, by boiling for an hour for three successive days. Hot-water Filter.—A copper funnel with double walls, the inter- space between which is iilled with hot water. A glass funnel fits in- side the copper cone, the stem of the glass funnel passing through and being tightly gripped by a per- forated caoutchouc plug, which fits in the opening at the apex of the cone. The water in the cone is heated by applying the flame of a burner to a tabular prolongation of the water-chamber. In a more recent model, as represented in Fig. 31, this prolongation is dis- pensed with, and the temperature is maintained by means of a circular burner which acts at the same time as a funnel ring. In Rohrbeck's model the funnel of the filter is connected with a flask, from which the test-tubes can be easily filled with the hquid jelly (Fig. 253). Glass Vessels.—A number of glass vessels should be kept in stock according to requirements. Bohemian hard glass flasks are employed in several sizes, for boiling nutrient media. The conical forms are especially used in the larger sizes for storing nutrient jelly. Glass funnels, large and small, are necessary, not only in the processes of preparing nutrient jelly, but for filtering solutions of aniline dyes and for g
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherphila, bookyear1897
