Sessional Papers of the Dominion of Canada Volume 25, No. 8

Sessional Papers of the Dominion of Canada Volume 25, No. 8

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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. 1892 edition. Excerpt: supply on the same day; but the differences are very small, and the former averages (line 6, Table III) are scarcely altered by the introduction of these numbers. I shall take the mean (given in line 8 of Table III) as characterizing the Ottawa River water above the Chaudiere Falls, i.e., above the sawdust deposits. _ In order to ascertain the possible influence of the sawdust deposits, I collected samples at two points further down the river, viz., at Grenville Rapids, above and below. and at St. Anne's. The samples taken at Grenville and Carillon (see line 17, Table III) show slightly higher mineral matter, with au increase in matter destruetible on ignition (chicny organic). This may possibly come from vegetable debris in the river, but is so very small in amount that it cannot be said to materially alter the character of the water; There is a slight increase of nitrogen both as free and albuminoid ammonia, with a slight decrease of nitrogen in nitrites or nitrates. owing, no doubt, to the destruction of these in contact with oxidisablc organic matter. The vegetable matter oxidisable by permanganic acid is scarcely higher than that found above the Chaudiere Falls, and is less than that found in Deschenes Lake. It seemed right before attributing even these sli ht changes to saw dust to consider the iniiuence ofthe city sewage upon the water. The sewers enter the river a short distance below New Edinburgh, and I took samples at a distance of about half a mile below the sewer mouths on the 19th of August. In the sample taken below the sewers on the 29th March (see Bulletin No. 15) I found no certain indications of sewage pollution, and this I attributed to the fact that more

Product details

  • Paperback | 76 pages
  • 189 x 246 x 4mm | 154g
  • United States
  • English
  • black & white illustrations
  • 1236807324
  • 9781236807328