. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . is then transferred Fig. 27.—Wynter Blyths tube for collecting sediments. to several glass slides, cover-glasses are applied, andthe examination by the microscope commenced ; — anyexcess of water upon the slide being removed by cleanblotting paper. Wynter Blyths tube is a convenient instrument forcollecting water sediments; as seen in the accompanyingfigure, it is similar in appearance to a huge pipettewhich is capable of holdin
. Public health laboratory work, including methods employed in bacteriological research, with special reference to the examination of air, water and food contributed . is then transferred Fig. 27.—Wynter Blyths tube for collecting sediments. to several glass slides, cover-glasses are applied, andthe examination by the microscope commenced ; — anyexcess of water upon the slide being removed by cleanblotting paper. Wynter Blyths tube is a convenient instrument forcollecting water sediments; as seen in the accompanyingfigure, it is similar in appearance to a huge pipettewhich is capable of holding about a litre of small glass cell fits over the small lower extremityof the tube, into which the deposited matter collectsafter a time. By the insertion of the long rod-shapedstopper, the cell and the sediment within it can easily beremoved undisturbed. The various forms of animal and vegetable life, and ?K 2 132 LABORATORY WORK. of inanimate organic and inorganic material, are bestsought after by commencing with the i inch power, nextpassing on to the J inch power, and then prosecuting theexamination further by means of the -f-^ inch oil immer-. FiG. 28.—Showing the sediment of a pond-water, a sample ofwhich was collected in the early spring (x 250). Drawn by A. , 1. A desmid. 2. Tabellaria floccosa (Diatomaceae). 3. Actinophrys. 4. A confervoid growth. 5. A vegetable fibre showing spiral cells. 6. Silicious particles. 7. Conferva. 8. Gomphonema. Various forms of minute unicellular plants are seen scattered aboutthe field. sion lens and an Abbes condenser. Further steps arenecessary in the examination of bacteria, for which thereader is directed to the section written by Dr. Boyce. EXAMINATION OF THE SEDIMENT. I33 If the suspended matter is so light that it will notsettle, drops of the water must be examined; but it mustbe extremely rare that any visible suspended matterdoes not deposit in part after an hour or two. Before giving a list of animate o
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