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OUTLINES OF BACTERIOLOGY 



surrounding atmosphere, and thus the room is apt to become too damp, 

 a condition which is not good for a bacteriological laboratory. In order 

 to prevent the dissipation of heat by radiation, Koch's steriliser is 



Fig. 65.— Koch's Steam- 

 steriliser. 



Lttrakemann's Steam -steriliser. 



usually covered with a coat of thick felt round the sides, and a cap 

 of the same material is placed on the cover. 



A far better steriliser is that of Liimkemann, because it condenses 

 almost the whole of its own steam, thus preventing the large escape 

 of the latter into the room. Fig. 66 illustrates this apparatus, which 

 is usually made of copper. The burner is applied underneath the 

 shallow pan A, which contains water. It will be noticed from the 



