--------------+---------------+-----------------+---------------------- | | Hardness | Mineral Matter. | | equivalent +--------+ +------ |Oxygen absorbed| to Carbonate | | |Total | at 80° Fahr. | of lime. |Organic | |Solids |--------+------+--------+--------+ and | |dried | In 15 | In 4 | Before | After |Volatile| | at |Minutes.|hours.|Boiling.|Boiling.|Matter. | |110°. --------------+--------+------+--------+--------+--------+------+------ Mohawk River, | 0·2071 |0·3704| 6·838 | 6·838 | 1·70 | 9·00 |10·70 above Diamond| Woollen Mills| Hudson River, | 0·2691 |0·4150| 3·818 | 3·818 | 2·20 | 5·80 | 8·00 above | Lansingburg | Troy hydrant | 0·2750 |0·4000| 4·498 | 4·498 | 2·60 | 6·50 | 9·00 Hudson River, | 0·2827 |0·4100| 5·049 | 4·839 | 2·40 | 5·30 | 7·70 at Maple | Island | Hudson River, | 0·1670 |0·3111| 5·897 | 5·897 | 1·40 | 9·80 |11·20 at inlet | Hudson River, | 0·1890 |0·3422| 6·237 | 6·237 | 5·00 | 7·20 |12·20 at inlet | Hudson River, | 0·2180 |0·3180| 6·237 | 6·086 | 1·80 | 9·20 |11·00 at inlet | Hudson River, | 0·2200 |0·3470| 6·048 | 6·048 | 4·80 | 8·20 |13·00 at inlet | Hudson River, | 0·2509 |0·4340| 5·470 | 5·470 | 3·50 | 4·50 | 8·00 50 ft. south | of inlet | Hudson River, | 0·2230 |0·4420| 5·838 | 5·838 | 1·50 | 7·50 | 9·00 at inlet | Bleecker | 0·1511 |0·2578| 5·330 | 3·893 | 2·50 | 8·80 |11·30 Reservoir | Bleecker | 0·1755 |0·3020| 6·577 | 6·577 | 5·70 | 6·80 |12·50 Reservoir | Tivoli Lake | 0·0780 |0·2030| 7·069 | 4·309 | 2·00 |12·00 |14·00 Tivoli Lake | 0·1200 |0·1852| 7·409 | 5·481 | 6·00 |11·00 |17·00 Tivoli Lake | 0·1075 |0·1762| 8·468 | 8·468 | 3·20 |10·40 |13·60 --------------+--------+------+--------+--------+--------+------+------ The variation in the composition of Croton water, at different seasons of the year, is exhibited by the table on p. 221, which gives the results of the semi-monthly examinations made by Dr. Elwyn Waller during the year 1885.[131] For the results of the analyses of the water of the Hudson River, recently made by Dr. C. F. Chandler, see table, pp. 222, 223.