907, issue of the Scien- closed in air-tight tins. The preparation is either of seven experiments that were carried out by the tific American. A positive transparency and a piece Chamber of Commerce for the Province of Saxony, in of wire gauze are all the requisites. The best results used in its… … must set up unhealthy conditions. In many instances, It is evident that after a negative of such an object PHOTOGBAPH MADE IN THE USUAL WAY. however, it has been observed that when the epidemic as a cushion is made, it can be used afterward to-' bfeaks out in a rat colony, the members as far as…
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