vi PREFACE 



and for revising the manuscript of the technical portion of this work ; 

 to Professor Giinther of the same Institute for the many pure cultures 

 he provided me with ; to Herr Hansel, Manager for Carl Zeiss in 

 Berlin, for his assistance in making the negatives reproduced by the 

 colotype process in the four plates at the end of this work, also for 

 valuable assistance in connection with the other illustrations ; to 

 Dr M'Lean, Fortrose; N.B., for revising the proof sheets and valuable 

 suggestions regarding same. 



I am also indebted to Herr Paul Altaian, 52 Luisen Strasse, and 

 Carl Zeiss, 29 Dorotheen Strasse, Berlin, for the loan of the blocks used 

 in illustrating the various Bacteriological Appliances. 



The Photomicrographs and Photographs in this work are original, 

 being taken from my own specimens and cultures, with the exception of 

 Figs. 58, 78, and Plate III, 18 ; Plate IV, 20, 24. 



THOS. BOWHILL. 



BACTERIOLOGICAL LABORATORY, 

 29 CHAMBERS STREET, 



EDINBURGH, October 1898. 



