Collected Reprints Volume 1

Collected Reprints Volume 1

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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. 1899 edition. Excerpt: ... The occasion for the greater production in this year is, it seems, the greater enrichment of the waters (though not in nitrates), the lower levels, and the slighter current, the latter affording time for breeding even upon the slowly rising flood. The same or even less rate of rise at higher levels--e. g. 1899--would be attended by a more rapid current with lessened time for production. The February pulse has a duration of 35 days, --from Jan. 25 to March 1, --with a maximum amplitude of.67 cm.3 per m.3 on the 3d. Its mean lies on the 7th, 16 days after that of the preceding pulse. This is a month of almost continual rise, there being only a slight cessation in the first week. The total movement in levels is 5.1 ft., of which the greater part is above bank height, and leads to extensive overflow. The large amounts of silt carried (PI. XII.) testify to the extent of the overflow and the access of flood waters of recent origin. These result in a continued reduction in free ammonia and chlorine, both of which reach approximately normal levels at the close of the month. Nitrates rise with access of flood waters, and the nitrites continue to decline, while the oxygen consumed and organic nitrogen rise with the increase of silt. Temperatures remain at the winter minimum throughout the month, and an imperfect and disintegrating ice-sheet covers the stream during a part of the month. The effect of the rising levels, access of recent flood waters, increased current and great volume of silt is seen in the falling off of the plankton content to a minimum of.02 cm3, per m.3 on March 1. The incipient pulse of production of an amplitude exceptional for this season is thus washed out, and the apex and mean of the pulse are shifted to the left. more

Product details

  • Paperback | 156 pages
  • 189 x 246 x 8mm | 290g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236569768
  • 9781236569769