260 J. M. Lewis: The Estimation of "- Acidity. 



In conclusion the writer would like to put on record his 

 appreciation of the many kindnesses extended to him over a 

 number of years by Prof. Osborne, but for whose encourage- 

 ment and help this work could not have been undertaken. 



The author has not hesitated to quote freely from the authori- 

 ties named, and trusts that the student may be led to read at 

 length the articles referred to. 



References. 



1. Bayliss. Principles of Physiology (1915). 



2. Lubs, H. A., Indicators and their Industrial Application- 



Jour. Industrial and Engineering Chemistry, Mar., 1920. 



3. Clark and Lubs. Thymosulphophthatein as an indicator- 



Jour. Am. Chem. Soc, 1918, 40, 1443-8. 



4. Walker,. Introduction to Physical Chemistry, 1909, p. 277. 



5. Milroy, T. H. Quar. Jour. Exp. Physiology, 1914, p. 142. 



6. Sharp and Hoagland. Jour. Agricultural Research, 1916,. 



vol. vii., p. 140. 



7. Michaelis. Hand, der Biochem. Arbeitsmethoden, V., p. 



500-524. 



8. Biglow. Theoretical and Physical Chemistry, p. 475. 



9. Bayliss. Principles of Physiology. 



10. Lehfeldt. Electrochemistry, pt. i., p. 163. 



11. Hildebrandt. Jour. Am. Chem. Soc, 1913, No. 7, p. 867. 



12. Biglow. Theoretical and Physical Chemistry, 1912, p. 480. 



13. Barendrect. Biochem. Jour., vol. ix., No. I., p. 66. 



14. Findlay. Practical Physical Chemistry, p. 219-228. 



15. Loomis and Acree. Amer. Chem. Jour., 1911, vol. xlvi., p.. 



585. 



16. Clark, W. M. Jour, of Biol. Chem., vol xxiii., p. 478. 



17. Walpole, S. S. Biochem. Jour., vol. vii, No. 4, p. 410. 



18. Roaf, H. E. Jour, of Physiology, vol. liv., xvii. 



19. Lehfeldt. Electrochemistry, Pt. I., p. 239. 



20. Hasselbalch. Biochem. Zeitschr, 1911, xxx., 317; 1913, 



xlix., 451. Compt, rend. trav. Lab. Carlsberg, 1911, x. 69. 



21. McLeod. Physiology and Biochem. in Modern Medicine. 



22. Schmidt and Hoagland. Univ. Cal. Publication. 



23. Clark, W. M. The Determination of Hydrogen Ions (1920). 



Thanks are also due to Dr. W. J. Young, of the Biochemical 

 Department of the Melbourne University, for his kindness in. 

 reading the proofs of the article. 



