J.H. Woodger 
Biological Principles [EPUB ebook] 
A Critical Study

First published in 2000. This is Volume VI of six in the Library of Philosophy series on the Philosophy of Science. Written in 1929, using the initial ideas of A.N. Whitehead, this book on Biological Principles includes the concept of abstraction methodology in biology. This expands into an investigation into the general problems of the theory of knowledge, difficulties in biological knowledge and finally suggestions towards a resolution of certain traditional biological conflicts.