130 THE CALL OF THE HEN. 



vigorous birds, and save the time wasted in trap-nesting a 

 lot of birds that you will eventually have to discard. 



CHAPTER XX. 



WALTER HOGAN'S SYSTEM. 



This chapter contains "Walter Hogan's System," as 

 written by M. F. Greeley, editor of the Dakota Farmer, to 

 whom I gave the notes. This was published in 1904. At that 

 time Mr. Greeley refused to put in anything about the skull 

 theory. He said that I would make myself the laughing-stock 

 of the world. I am merely putting this old work in this book 

 in order that the reader may know the evolution of the dis- 

 covery. The pelvic-bone method of selection was, of course, 

 my first discovery; then later, the relation between depth of 

 abdomen and thickness of pelvic bones; after that, the working 

 out of the mathematical relation between egg-laying ability 

 and those points before mentioned. 



When I came to California I gave out merely the "Walter 

 Hogan's System" which had been printed in Minnesota; later 

 I published a "Supplement," which gave a general idea of the 

 capacity and type proposition ; still later I issued typewritten 

 charts as they are found in this book. I could have done all 

 of this many years ago, but my reasons for not doing it are ex- 

 plained elsewhere. 



I do not desire any of my readers to make the mistake of 

 considering what comes after this as having anything to do 

 with "The Call of the Hen," except in a historical way. 



WALTER HOGAX. 



Petaluma, Calif., July 31, 1913. 



