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say the phenomenon is one of heat Charpentier has placed frogs on ice 

 and lowered their temperatui'e below that of the screen and shown that 

 the cold frog is still a source. 



Charpentier describes experiments in which N-rays are conducted 

 along wire. Two phosphorescent screens are attached on the ends of 

 a wire, length in one case 300 cm. N radiation is allowed to fall on 

 one screen and the screen on the other end is seen to become more 

 luminous. The N-rays are found by Charpentier to have the property of 

 increasing the intensity of certain odors: ammonia, acetic acid, etc. 



E. Meyer has found that plants emit N-rays. Certain substances 

 while going into solution become sources. The electrolyte of a Le Clanche 

 cell has been found to be a strong source after the cell has been short- 

 circuited. 



One curious fact about N-rays is that up to very recently at least, 

 every successful experimenter has been a Frenchman. 



Numerous short articles have appeared explaining the phenomena 

 as one of heat or as one due to psychical phenomena. 



Although we so far, like many others, have not been successful, we 

 thought an account of our attempts was worthy of mention. 



It was evident after a number of preliminary trials that the eye 

 could not be relied upon to detect the vai'iation in a feebly luminous 

 source of light. The rays are produced by a Welsbach burner shut up In 

 an iron pipe about 50 cm. long, 10 cm. in diameter with walls 1 cm. thick. 

 The pipe is pierced by a windnAv about ."> cm. long and 2 cm. in width 



W 



and closed by some black paper, and a sheet of aluminum 10 mm. thick. 

 The general arrangement of the apparatus is that shown in Fig. I. The 

 17— A. or SciKNCB, '04. 



