PREFACE v 



in the mode of presentation, both of which are more fully and more satis- 

 factorily covered in the systematic texts upon the subject. Especial 

 acknowledgment should be made for the use of the series of descriptive 

 terms and the accompanying illustrations on pages 172-184, which have 

 been taken from Chester's Determinative Bacteriology, 1901, with the kind 

 permission of its author. It is only as an attempt toward fixation of sys- 

 tematic procedures in class work that the writer can hope to have added in 

 the least to the advance of a subject in which so much good work has been 

 done by a host of laborers. Should this prove true it will not be a source 

 of regret that this scheme, imperfect and incomplete as it is, has thus been 

 made public. A. J. S. 



GALVESTON, TEXAS, August 79, 1902. 



