BACTERIA IN THE INDUSTRIES 179 



c. Ova of Nematodes. 



d. Hair of animals. 



e. Insect fragments. 



f. Animal excreta. 



II. Sewage Indicators. 



1. Kitchen refuse. Vegetable. 



a. Starches. Cereal, potato, bean, etc. 



b. Spice elements. 



c. Vegetable tissues derived from fruits, roots, tubers, bulbs, 

 etc., used as food. 



2. Kitchen refuse. Animal. 



a. Blood corpuscles. 



b. Oil and fat globules. 



c. Muscle elements. 



d. Fibrous tissue elements. 



e. Ova of intestinal parasites. 



3. Bacteria. 



a. Coccus forms, abundant. 



b. Diplobacilli, usually abundant. 



c. Streptococcus fecalis, usually present. A positive sewage 

 indicator. 



d. A positive presumptive colon bacillus test. 



4. Other organisms. 



a. Yeasts and mold may be present. 



b. Spores of molds and ova of intestinal parasites may be 

 present. 



c. Motile protozoa. 



III. Mineral and inorganic. 



1. Oil or resinoid matter derived from vegetable decay (pines). 



2. Dirt and clay particles. 



3. Sand particles. Coarse and fine. Colorless and colored. 



4. Mineral particles and particles of mineral compounds. Color- 

 less and with color. Iron compounds. 



5. Diatomaceous earth. Kaolin. Etc. 



IV. Amorphous organic particles. These are present in direct proportion 

 to organic contamination. 



The analyst should note the following regarding possibly available 

 sources of water supply. 



1. The character of the underlying geologic formation. 



2. The surrounding vegetation and the animals that dwell in the 

 vicinity. 



