vi CONTENTS. 
CHAPTER VI. Page. 
PREVALENCE AND SIGNIFICANCE OF CLASS OF ORGANISM WHICH FERMENT 
GLUCOSE BUT NOT LACTOSE IN SURFACE WATERS. ; 
Madras results of 1907-8—Discussion and conclusion from these 
results—Results obtained from Hughli river during 1910— 
Discussion of same—Houston’s results on Thames water— 
Results of experiments on an artificially polluted tank—Re- 
sults obtained from Red Hills Lake, Madras—Results obtained 
from large rivers in Bengal—Explanation of phenomena dis- 
covered—Best method of estimating the number of glucose+ 
lactose — Bacilli present in water—Conclusion .. ..) 332 
CHAPTER VE. 
ACTION OF DIRECT SUNLIGHT ON COMMON F2CAL ORGANISM. 
Description of experiments—Results of experiments—Possible ob- 
jection to experiments—Conclusion Zs .. 63—8I 
CHAPTER VIII. 
THE EFFECT OF SUNLIGHT ON LARGE NATURAL LAKES. 
Description of Red Hills Lake—Results obtained during 1908— 
Description of various samples—Conclusions from this work 
—Second series of investigation on Red Hills Lake in t911—Re- 
sults—Discussion of results obtained from an artificially pol- 
luted tank—Conclusions.. - Ep ». 82—93 
CHAPTER IX. 
RESULTS OF ANALYSIS OF THE WATER OF LAKES AND RIVERS IN INDIA. 
Results obtained from Madras lakes in 1908—Meteorological con- 
dition—Discussion of results—Results obtained from Madras 
lake in 1910—Results obtained from Madras rivers in 1910— 
Results obtained from Bengal rivers in 1911—Conclusions .. 94—107 
CHAPTER X., 
THE POSITION OF CERTAIN FACAL ORGANISM IN NATURE. 
Coli Communis of Escherich—Oxytocus Perniciosus—Bacillus Lac- 
tis erogenes—Bacillus Cloaca—Bacillus Vesiculosus and 
Grunthal group—Bacilli acidi lactici—Levans—Bacillus No. 6 
—Bacillus No. 9—Bacillus No. 33—Bacillus No. 67—Bacil- 
lus No. 72—Bacillus Nos. 73 & 75—Bacillus Nos. 100 & 101— 
Bacillus Coscoroba—Bacillus P—Stages in the self-purifica- 
tion process oe sy 102—II5 

