PREFACE 
The laboratory exercises given in this manual are those which the writers 
give to their students in General Elementary Bacteriology, a course in which the 
students spend in the laboratory three periods a week of two and one-half hours 
each during one semester. Only those exercises are included which are actually 
performed by the students. An especial effort has been made to include only 
such methods as give definite and satisfactory results in the hands of the students. 
No apology is offered for the selection of material included in these exer- 
cises, though it is of coutse recognized that equally satisfactory selections might 
be made which would vary greatly in nature and scope from the subject matter 
here included. It is recognized that many important aspects of bacteriology, 
which are necessarily covered in the class-work in a course in General Bacter- 
iology, are entirely omitted in these laboratory outlines. The exercises are in- 
tended to serve only as a laboratory guide and not in any sense to take the place 
of the instruction and personal direction which must be given in the laboratory. 
NORTON PRINTING CQ, 
