20 THE SIGNS OF LIFE [LECT. i. 



REFERENCES 



BURDON-SANDERSON. "On the Electro-motive Properties of the Leaf of 

 Dionoea," Proc. Roy. Soc., p. 495, 1873 ; Phil. Trans. Roy. Soc., 1882 ; 

 Phil. Trans. Roy. Sac., p. 417, 1888. 



HORACE BROWN AND F. ESCOMBE. " Note on the Influence of very Low 

 Temperatures on the Germinative Power of Seeds," Proc. Roy. Soc., Ixii., 

 1897, p. 1 60. 



THISELTON-DYER. " On the Influence of the Temperature of Liquid Hydro- 

 gen on the Germinative Power of Seeds," Proc. Roy. Soc., Ixv., 1899, p. 



361. 

 WALLER. " An Attempt to estimate the Vitality of Seeds by an Electrical 



Method," Proc. Roy. Soc., vol. Ixviii., 1901, p. 79. 

 WALLER. Lectures on Animal Electricity, 1897. 

 WALLER. " Researches in Vegetable Electricity," International Congress 



of Physiologists, Turin, September 1901. 

 WALLER. "Electrical Response of Vegetable Protoplasm to Mechanical 



Excitation," Proc. Physiol. Soc., November 1901. 

 BURCH. " On the Interpretation of Photographic Records of the Response 



of Nerve" [Terminology], Proc. Roy. Soc., vol. Ixx., 1902, p. 194. 



Note. The misuse of the terms "ELECTRO-POSITIVE" and "ELECTRO-NEGA- 

 TIVE," to which I called attention six years ago in the first paragraph of Lectures on 

 Animal Electricity, is now very generally recognised. In the Oxford Laboratory 

 the remedy proposed is to simply transpose the words ; but until a general agreement 

 is arrived at that " POSITIVE " (new style} is to be the equivalent of " NEGATIVE " (old 

 style), and vice versa, I think the remedy will be even more prejudicial to clear think- 

 ing than the disease. I do not think the word " zincative " has yet fully served its 

 purpose, and shall therefore continue to use it when it appears to me to be required. 



