ordinary rt 0 Tracing Contagion. The base of the post, which is about two feet wide, rests Argand chimney mounted on a stand of convenient height. The upper end of the glassis covered by acap of wire gauze, in the center of which a hole of about four or five mm. dia- meter has been punched. The… … more numerous than the blood cor- On gently blowing through this nar- puscles, which appeared unchanged. row tube (which for convenience This case shows that milk is for- should have a flexible India-rubber warded to market drawn from cows which are within a few secured to the top.of the post. This…
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