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. 1.3 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-supek-Marb. 



