Rouse, Respiration in Pigeons. 



501 



'that stimulating^ the beaks of some diving animals with water, 

 resuhs in a considerable arrest of breathiner. 



;J-V^>V~'^J^^^Vlrv^J-7^^ 



Fig. S- Reaction to mechanical stimulation. 



4. Visual. Fla-^hes of h\dit jDroduced considerable dis- 

 turbance in the breathing car\e (see Figs. 6 and 7). The 

 reaction was principally an immediate quickening and shallow- 



Fig 6. Reaction to red light stimulation. 



fli 



Reaction to blue lisiht stimulation. 



ing, with occasional pauses and minute irregularities. An oc- 

 casional respiration showed a deepening, but this was probably 

 due to labratoi}' conditions which could not be controlled, for 

 example, jars. No such marked amplitude changes were ob- 



