PREFACE vii 



information are acknowledged in the text. I am indebted to 

 the Dairy Supply Company, Messrs. Lumley and Company, 

 and Messrs. Lawrence and Company for the loan of blocks. 

 Several illustrations have been supplied to me by friends, 

 while in particular Figs. 13 to 17, and 19, 20, and 21 have 

 been obtained through the kindness of Dr. D. S. Davies, 

 Medical Officer of Health, Bristol. All but one of these 

 photographs were taken by Mr. Leat, Inspector of Dairies, 

 Cowsheds, and Milkshops at Bristol, who has been at great 

 trouble to obtain excellent photographs of the conditions 

 illustrated. 



No bibliography is appended since one would be of 

 limited utility owing to the enormous number of references 

 which would have to be included. Eeferences to papers and 

 reports are given as footnotes and, as far as practicable, and 

 indeed in almost every case, I have directly consulted the 

 original reports and selected the data bearing upon the 



subject under consideration. 



WILLIAM G. SAVAGE. 



WESTON-SUPER-MARE. 



