BIBLIOGRAPHY 399 



Wittgenstein, Ludwig J. J. Anglo-Austrian philosopher (1889-1951) 

 Preliminary Studies for the "Philosophical Investigations" (Harper, 

 New York, 1958) 23/5 



WoLFFLiN, Heinrich. German historian of art (1864-1945) 

 324/Principles of Art History 



WoLLASTON, William Hyde. British chemist and physicist (1766-1828) 

 Article in Phil Trans. 104 ( 1814) 252/7 



Young, John Zachary. British anatomist ( 1907- ) 



Doubt and Certainty in Science (Oxford Univ. Press, 1951) 7/62 



ZiRKLE, Conway. American botanist ( 1895- ) 

 346/quoted by R. Taton, op. cit., p. 129 



