Rouse, Respiration in Pigeons. 509 



The figures in Table II indicate that the animals recovered 

 more quickly from the effect of red light stimulation than from 

 the effects of other kinds. The average rates for blue in the 

 recovery are sometimes less than for yellow and green, but they 

 are always greater than for red. Yellow retained its stimulat- 

 ing effect longest. 



Putting together the average results of Tables I and III we 

 have the following comparison : 



Total Color Choices "t 

 of five animals j 

 Respiratory Quick- ) ^ , ^ , 



ening of ten animals!" 9-94/. 10.39/0 10.41% 12.11% 



It will be seen that there is a direct correspondence be- 

 tween the two sets of results, although the proportions do not 

 hold, since the figures representing the breathing reactions to 

 red and to yellow, or to yellow and to green, lie much nearer 

 together than do the corresponding color choices ; and since, 

 also, those representing the choices of green and blue are much 

 more nearly equal than the corresponding respiratory percen- 

 tages. The five pigeons used in the experiment first reported 

 were not employed in the second, but they were the same spe- 

 cies and had been raised in the same cote and general sur- 

 roundings. Hence, we should probably be justified in inferring, 

 on the basis of two sets of data, that increased respiratory activity 

 is a sign of agreeable stimulation in pigeons as in man,^ and this 

 especially if we recall that the amplitude of the animals' breath- 

 ing curve, when varying at all, generally became shallower, and 

 that frequently certain minute irregularities of contour were 

 noticed, as often occurs in human respiration during stimulations 

 of a pleasant character. 



2. Reactions to light of different intensity. Only four 

 animals were used in this part of the investigation. Each was 



'ZoNEFF and Meumann, op. cit. 



Angell, J. R. and Thompson, H. B. Organic Processes and Consciousness. 

 Psychological Review, 6, 32-69, 1899. 



IsENBERG, D. und VoGT, O. Athmung, Zeitschrift f. Hypnotismus, 10, 131- 

 158, 1900. 



