This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 Excerpt: ...The net temperature decline is only 10, reaching, however, almost the winter minimum. There is no rapid decline in temperature, and the hydrographic changes are also relatively gradual with the exception only of the rise on the 17th. There is under these conditions a gradual, though slight, rise in production, which ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1903 Excerpt: ...The net temperature decline is only 10, reaching, however, almost the winter minimum. There is no rapid decline in temperature, and the hydrographic changes are also relatively gradual with the exception only of the rise on the 17th. There is under these conditions a gradual, though slight, rise in production, which with the establishment of winter temperatures and decline in levels culminates at 1.26 cm.' on Dec. 6. Increase in stability even in winter conditions thus tends to increase production. This November pulse drops suddenly in the silt-laden waters of the slight rise in river level on Dec. 11 to a minimum of.01 on the 13th. The completeness of this decline is doubtless due to the fact that this collection was made in storm waters of recent local origin due to local rains. Flood waters of slight extent were thus intercalated in the stream, and if there was a normal decline in production accelerated it to this extent; or it may be that the flood is solely responsible for the separation of the November and December pulses. The cyclic movement elsewhere renders this also a matter of conjecture. The December pulse has a duration of 28 days, --from Dec. 13 to Jan. 10, --with a maximum of 1.98 cm.3 perm.3 on Dec. 20. Its mean falls on the 22d, 20 days after that of the preceding pulse. This is a month of falling river levels with the exception of the rise of.4 ft. on the 11th. The total movement is 3.4 ft. Since, however, all but 0.4 ft. of this is downward movement, the environmental stability is greater than the extent of the movement indicates. Temperatures under the thin ice-sheet that formed in the first week change less than 2, and throughout the period of the pulse the several forms of nitrogen (PI. XLV.) vary but little. The chlorine, free ammonia, .
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