of reproduction in the liquids employed for their cultiva tion. The effect of the wind at Montsouris is partially due to this cause and also the position of the observatory on the south side of the city. The numbers were as follow: Just in proportion as we penetrate into Paris the number of bacteria increased enormously without exactly following the variations noticed at Montsouris. There were found in the Rue de Rivoli at the height of one of the first story windows of the Mairie of the IV. Arrondissement the fol lowing numbers: The effect of private houses was found to be very appre ciable
of reproduction in the liquids employed for their cultiva tion. The effect of the wind at Montsouris is partially due to this cause and also the position of the observatory on the south side of the city. The numbers were as follow: Just in proportion as we penetrate into Paris the number of bacteria increased enormously without exactly following the variations noticed at Montsouris. There were found in the Rue de Rivoli at the height of one of the first story windows of the Mairie of the IV. Arrondissement the fol lowing numbers: The effect of private houses was found to be very appre ciable; they are very rich in bacteria and the more so the poorer the ventilation. This is shown by an example of air taken from Hospital de la Pitie the number per cubic meter being as follows: As soon as the season allowed the windows to be opened the number of microbes indoors decreased but increased on the street. It is indeed Paris itself her inhabitants and her animals that are the origin of these microbes because if we examine the air that hovers over the city even at the height of the lantern on the Pantheon we will find but very few microbes in it. If we examine the dry dust that falls on the furniture of the rooms we notice the same increase from the circumfer ence of Paris toward its center. Bacteria in 1 gramme of dust at the Observatory Mont souris 750000. In apartments in Rue de Rennes 1300000. In apartments in Rue Monge 2100000. The proportions of each kind also vary at the same time. The number of bacilli decrease wbile the micrococci and bacteria increase. In spite of the minute size of the microgerms and the facility with which they are transported by the wind their diffusion through the air can only be perceived through short distances. Whatever it may be that is the center of emanations its germs are very soon drow tied in such a mass of air and they are rarefied to such an extent that the most formidable of them are no longer to be dreaded. It is not so with dust t
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