Public Documents of Massachusetts Volume 4, PT. 1
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 edition. Excerpt: ... also those found in sparsely settled neighborhoods and under conditions as nearly " normal" as possible, that is, not in any way exposed to house drainage or sewage of any kind. A series of springs situated in a country district of southern New Hampshire was first selected for examination. The samples were all planted on the day of collection. External conditions were quite favorable, as the ground was frozen, and covered with six inches of snow. No rain had fallen for several days, thus reducing the liability to contamination from surface water to a minimum. Open Spring No. 1.--Situated in afield on edge of meadow. "Water comes up through a stratum of clay. Rate, several barrels per hour. Water clear and colorless. Date of analysis, Nov. 29, 1894. Bacteria per cubic centimeter, on gelatin, 252, 258; on glycerin agar, 143, 167. Open Spring No. 2.--About 500 feet from No. 1. Conditions nearly the same, but the bottom of the spring is covered with a layer of fine sediment. Algse, etc., grow in the water. Date of analysis, Nov. 29, 1894. Bacteria per cubic centimeter, gelatin, 163, 134; glycerin agar, 133, 133. Open Spring No. 3.--Situated in meadow at base of a wooded hill 400 feet high. No habitation within one-half mile. Other conditions similar to those in No. 2. Date of analysis, Nov. 29, 1894. Bacteria per cubic centimeter, gelatin, 92, 105; glycerin agar, 72, 79. Open Spring No. 4.--Situated on southern slope of hill mentioned in description of No. 3, about 150 feet below the summit, in wooded region. Oak, birch and pine trees all around. No cultivated land above. Soil gravelly. Date of analysis, Nov. 29, 1894. Bacteria per cubic centimeter, gelatin, 95, 106; glycerin agar, 89, 96. Open Spring No. 5.--Open land, near...
- Paperback | 218 pages
- 189 x 246 x 12mm | 399g
- 13 Sep 2013
- Illustrations, black and white