54 THE ANALYST, APPARATUS. (Anaer. Chem. Joumz., 1898, xx. 577-580.)-The essential pmts of this apparatus are: (1) h receiver A in the form of a cylinder (8 inches long and 6 inches in diameter) divided into three compartments b, c, and d by the partitions p and p‘. Between b and c is a circular opening 2 inches in diameter, and two smaller openings are placed between c and d. (2) An injector tube, E, 79 inches long and inch outside diameter, provided at the top with the A Hew Form of Water Blast. .” Fig 1. Rgm. f unnel-shaped projection g. (3) An outlet tube f with a diameter equal to that of I , extending up- ward from c and curving over and downward to g. The tube t (2- inch in diameter) opens intof and extends tog. Xis a stop- cock opening into d, and K a nozzle with an orifice attached to the upper part of f.The axes of K and I are made to exactly coincide. In action the cock X is opened, and the water turned on. The jet of water issuing from K passes through I and falls into the compartment b. When the level of the water in b rises above the - _ :6 inch in diameter lower end of the tube Z, a considerable volume of air is swept into A , escaping through f and S, and later through S only. The water flows from b into c through the opening in the partition. The cock X is now closed, and the increase of pressure in the receiver forces the wateis up through f and into g. The jet from Know strikes on the surface of the water in y and drives it down into A , together with a large volume of air. If the cock S be now opened a current of air of sufficient pressure to supply a large blast lamp will be obtained.Spurting is prevented by surrounding g with a cylindrical case h, having openings in the top to allow air to enter, and an overflow pipe 41 for the escape of water. Fig. 1 is a vertical section of the complete apparatus ; Fig. 2 is 8 projection from above; a d Fig. 3 a section through the middle of the receiver. The advantages claimed for this blast over that of Richards and that of Muenke are : That the orifice for the entrance of air and water is of such ample size that anyTHE ANALYST. 55 considerable friction is avoided; that owing to the injector tube being perfectly straight the jet of water is not deflected, and the maximum effect is obtained; and that the energy is transmitted to a much greater volume of water, which circulates continuously from f through I and acts as a piston which completely fills the cross section of the tube.This apparatus can be obtained from Eimer and Amend, New York. C. A. M. Apparatus for Increasing the Speed of Filtrations, H. von Winkler. (Chem. Zeit., 1898, xxii., 1066.)-This apparatus is specially suitable for the filtration of minute quantities of liquid where the use of the filter pump is impracticable. It consists essentially of a glass plate, one side ground true, having at its cenkre a tube projecting at right angles to which a rubber tube can be affixed. A funnel with a ground edge is carefully fitted with a strong paper and filled Kith the liquid ; the disc is placed on top and held in position with the fingers, while air is blown through the tube by means of the mouth, thus increasing the effective pressure.The disc may be of vulcanite, with a soft bearing surface if preferred; or the glass may be moistened (in order to make a better joint) with some of the same liquid as that under treatment. F. H. L. REVIEW. AN ATLAS OF BACTERIOLOGY. By CHARLES SLATER, M.A., M.B., M.R.C.S. prig.), F.C.S.; and EDMUND J. SPITTA, L.R.C.P. (Lond.), M.R.C.S. (Eng.), F.R.A.S. (London : The Scientific Press, Limited.) This work consists of 111 original photomicrographs, together with explanatory text, a photographic introduction, and a bacteriological introduction. The photo- graphic introduction will be found very useful to anyone who desires to keep a permanent record of his bacteriological results, containing as it does many practical hints on the selection of objectives and general optical apparatus.The reeults obtained by the authors show evidence of much patience and manipulative skill, while the process reproduction is excellent. I n the bacteriological introduction a description is given of the morphology and reproduction of the Xchizophytes. The photographic illustrations of cultures and microscopic appearances of the more important bacteria follow, together with a rhumb of the chief characteristics of each. Amongst other organisms, Bacillus nnthracis, B. tuberculosis, B. typhoszcs, B. coli communis, B. diphtheriw, SpirilLun8 cholera Asiatica are very fully illustrated. Attention is to be directed to plates 16 (B. anthracis, envelope), 17 (B.anthracis, spore formation), 18 (B. mzthrncis, stab culture), 53 (B. typhosus, gelatine streak culture), 60 (B. coli comnzzinis, gelatine streak culture), 69 and 70 (B. diplitlzeria, culture), and the plates illustrating the differentiation of Sp. cholera Asiatic@ (79 and SO), and Sp. Finklerii (84 and 85). I n a future edition it may be hoped that illustrations of colonies of many of the more important pathogenic and non- pathogenic organisms, as they appear when grown on phenolized agar jelly at 37" C., will. be added, for although they lqse many characteristics, yet it is in this orm that they are generally met with in the bacteriological examination-for instance, of water. The appearance of actual colonies and characteristic growths Price 7s. 6d.56 THE ANALYST. would seem to be of equal importance with the microscopical appearance of the organisms themselves. As it is, the book is one which every analyst should p s e s s for reference who systematically examines water bacteriologically. J. F. H. (3.