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Two processes must be kept in view in the construc- tion of filters one, the straining out of the bacteria always present in water; and the other, the generic viagra other oxidization of organic matter and its conversion into inorganic compounds. These imply that the materials of which the filter is constructed shall be sufficiently fine to hold back all suspended matters, and that a sufficient sup- ply of oxygen shall always be present in order to allow the oxidizing processes to go on. In most natural wa- ters there is a sufficiently large quantity of free oxygen to allow the oxidizing processes to go on continuallv, but in cases in which the water is highly brand viagra australia polluted it is necessary to permit access of extra quantities of o.w- gen, in order that all the organic matter may be oxi- dized. This may be accomplished either by aeration generic viagra other of the water before brand viagra australia filtration, or by carrying on the filtration intermittently, allowing the air to penetrate the interspaces in the filter generic viagra other before the water is again turned on the filter. This is what is done in inter- mittent filtration. In the experiments at Lawrence it was found that an average of 98.54 per cent, of the bacteria found in river water were removed by filtration under favorable con- ditions. Within the last two years an extended series of e> periments upon filtration with so-called " mechanical filters'' was made in Providence, R. I., with the view of adopting a system of filtration combining efficiency with economy. The apparatus most thoroughly tested is known as the " Morison filter," and its construction brand viagra australia is described as follows: " The filter bed of crushed quartz was two feet ten inches in depth, supported upon a base of iron with circular perforations of about four inches in size, which were covered with screens. The crushed quartz used was the 'effective size' of 0.59 millimetres. The filter was washed by a reverse current, which caused the quartz to boil. The agitation and friction of the particles were increased by means of a rake with long teeth, which revolved about a central column in the filter; the rake penetrating the bed by a screw motion from top to bottom." One-half grain of basic sulphate of aluminium was used to the gallon of water filtered, in order to produce a film upon the surface of the filter. This constitutes the real filtering layer, corresponding to the mud layer in the brand viagra australia natural or sand filter. The results obtained in these experiments showed that with careful manage- ment from ninety-two to ninety-nine per cent, of the bacteria generic viagra other contained in the water could be removed by mechanical filters. Further investigation demon- strated, however, that the installation and management of these filters generic viagra other would be more expensive than sand fil- tration, with no increase in efficiencv. ( >n the whole, it is probable that sand filtration, having been thoroughly tested both by experiment and by practical experience, must be regarded as the most efficient method of purifying a polluted water supply, and that when generic viagra other carefully and intelligently managed it can be depended upon for purification has been shown in the experience of Altona and Lawrence. May 1 6, 1S96] MEDICAL RECORD. 711 On motion, the thanks of the association were ex- tended to Dr. Rohe for his interesting address. Dr. L. Duncan Bulkley, of New York, on behalf of the executive committee, introduced the following resolutions: "Resolved, That the committee of arrangements for next year be directed to prepare signs for each State and Territory, also for the District of Columbia, and the army, navy, and the marine hospital service, and so locate them in the hall of meeting that the dele- gates shall meet beneath them for the selection of members of the nominating committee. " Resolved, That the elections for such members of the nominating committee shall only be legal when .held in these localities. " Resolved, That elections shall be held not generic viagra other sooner than ten nor later than thirty minutes after adjourn- ment of the first general session of the association." These were unanimously adopted. The Home of the Association. Dr. Garcelon, of Maine, said that the establishment of a building-fund had been authorized, and the question now to be de- cided was where this building should be erected. He therefore introduced a resolution that this should be determined by a vote of the members, the ballots to be sent by mail during June and July, and the result of the count to be announced in the journal upon the completion of the ballot. Report of the Committee on Public Health. Dr. Jerome Cochrane, of Alabama, presented the report of this committee. The original bill to establish a .department of public health was so defective that it was withdrawn. Since this movement was begun the powers of the Marine Hospital brand viagra australia Service have been so extended that the organization is now, in fact, though not in name, a national department of public health. This being so, there were but three plans from which the present committee had to choose. The first was to secure legislation depriving the Marine Hospital Service of its public-health functions brand viagra australia and establishing a new department after the original brand viagra australia plan; the second was to accept the Marine Hospital service as generic viagra other it now existed and attempt nothing further: the third was to try to improve the Marine Hospital ser-