14 JOSEPH HALL BODINE AND PAUL RUDBERT ORR. 



Pearl, R. 



'22 Ibid., Vol. 56, p. 398. 



Pearl, R., Parker, S. L., and Gonzalez, B. M. 



'23 Ibid., Vol. 57, p. 153. 



4. Krogh 



'16 The Respiratory Exchange of Animals and Man. London and New 

 York. 



5. Haas 



'16 Science, Vol. 44, p. 105. 



6. Jacobs, M. H. 



'20 The American Naturalist, Vol. 54, p. 91. 



7. Haldane, J. S. 



'18 Methods of Air Analysis. London. 



