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RESEARCHES ON FUNGI 



chloride solution in such a manner that their bases become sub- 

 merged. Set the dish in a cool room (about 10° C), and cover 



Fig. 167. — On the left, a bacterial lamp photographed by its own light. 

 Colonies of Bacterium phosphoreum are growing in a layer of salt- 

 peptone-gelatine which covers the side of the conical flask (1-2 

 litres capacity). The cotton-wool stopper in the mouth of the 

 flask gives off no light whatever. Time of exposure, 12 hours. 

 This lamp gave out a strong light for 14 days, and with it one could 

 read a watch or the scale of a thermometer, recognise a person two 

 metres away, etc. Reduced in size. On the right, a white por- 

 celain bust of Schiller photographed by the light of nine bacterial 

 lamps each of 1 litre capacity. Time of exposure, 15 hours. Re- 

 duced in size. Both photographs taken by Hans Molisch. From 

 his Leuchtende Pflanzen, Taf. I, Figs. 1 and 5. 



with a bell-jar. At the end of 1-4 days colonies of luminescent 

 bacteria develop on the exposed surfaces of the meat and make the 

 meat luminous in spots or patches. With Molisch 68 per cent, of 

 the pieces of meat became luminous. At Winnipeg, some years ago, 

 using the method just described, I found that about 50 per cent, of 

 the pieces of meat became luminous. 



