238 INTESTIN AL BACTERIA 
Number of Bacteria in Feces. The different investigators are not 
in agrcement on this question. This may be in part due to different 
methods of analysis and to the variations in samples. The securing of 
concordant results is hardly to be expected. The data which are on 
hand vary from 5 to 50 per cent. Strasburger (1896) stated that one- 
third of the feces of an individual on a normal diet was bacteria. The 
quantity of daily bacterial wastes dried in adults was as follows: 
a. Eight gms. under normal conditions. 
b. In dyspeptic intestinal conditions on an average of 14 gms. and 
even as much as 20 gms. 
c. In chronic constipation 5.5 gms. and, at times, even as little as 
2.6 gms, 
The total number of bacteria climinated by an individual in one day 
was believed by Strasburger to be 128,000,000,000. Among the deter- 
minations which have been made by different investigators are the fol- 
lowing collected by Mattill and Hawk (1911): 
terme, 
Daily Excretion Percentage of 
Bacteria, Dry Bacteria. 
Strasburger.. 0.0.0... ec ceee eenee eee ees 8.0 gms. 24.3 % 
Berger and Tsuchiya...............4. ne 3.023 12.60 
MeNeal, Latzer and Kerr... 1.2.0.2... cece eee eens 5.34 26.90 
Mattill and Hawk..... 0... ccc ce ee eee eens 8.27 27.97 
Sato... ccc cc cc eee ee eee eee e eee eeneneeens 8.54 24.39 
Schittenhelm and Tollens........... 0.000 cece ee eee ee] se eeeeeees 42.00 
LisSauer.. oo ee eee eee cece cnet eee ee eeees| sevseveens 8.67 
TODaya.. cc ce ee eee ce ee tenet tence nee nea| ceeeeeeeee 11.22 
Osborne and Mendel (1914) found that about 70 per cent of the 
nitrogen in feces of animals was caused by bacteria. 
Classification of Intestinal Bacteria. Since the intestinal flora is 
quite extensive it is not a simple matter to make a classification. The 
viewpoint and interests of the investigator might influence the kind of 
classification made. Ford classified the bacteria in the duodenum of 
infants. The following classification by Distaso (1912) is as satisfactory 
as any: 
