778 THE FRESH- WATER 
LOCHS OF SCOTLAND 
Ness, Loch, abyssal life iu, 291, 292, 293, 
307, 311. 
composition of water of, 149. 
deposits from, 269. 
flora of, 197, 200. 
seiches in, 31, 53. 
temperature of, 94, 96. 98, 99, 100, 
101, 102, 103, 110, 112, 115, 117, 
118, 121, 122, 123, 124, 126, 127. 
128, 131, 132, 134, 135, 138, 141^ 
379, 380, 428. 
variation in level of, 198, 
Nette, River, 645. 
Neuchatel, Lake of, 396, 595. 
seiches in, 53. 
Neuenburger See, 595. 
Neumayer, — , 419, 602. 
Neusiedler See, 586. 
Neva, River, 581. 
Neveu-Leniaire, M., 568, 570. 
New British records by Lake Survey, 310. 
New England, lakes of, 622. 
New species collected by Lake Survey, 310. 
New Zealand, 641, 647. 
Newton, E. T., 454. 
Ngami, Lake, 566, 568. 
Ngangtse-tso, 539. 
Niagara Falls, 623. 
River, 623. 
Nicaragua, Lake, 638, 639. 
Nicol, J., 441. 
Niger, River, 650. 
Nile, River, 606, 610, 612, 650. 
Nitrogen in lakes, etc., 154. 
No, Lake, 611. 
Noddeboholt, Lake, 387. 
Northern Block (North-West Highlands), 
sculpture of, 459, 462. 
consequent streams of, 459. 
obsequent streams of, 459. 
subsequent streams of, 460. 
shatter-belts in, 459, 460. 
Nyasa, Lake, 521, 605, 606, 616, 617, 
618. 
Nyiro, Mount, 620. 
Nympliseacea?, 170, 357. 
Obersee, temperatures in, 115. 
Obi, River, 599. 
Ocean, composition of water of, 151. 
Ochreous muds in Scottish lochs, 265, 269. 
Ochrida, River, 588. 
Ogle, Glen, 70, 76. 
Oglio, valley, 590. 
Ohau, River, 643. 
Ohio, River, 632, 634. 
Oich, Loch, flora of, 164, 167, 196, 200, 
201, 225. 
freezing of, 140. 
plankton of, 341, 344. 
Oich, River, 198. 
Okaro, Lake, 647. 
Okavango, River, 568. 
Okere, River, 643. 
Olavat, Loch, plankton of, 348. 
Old Red Sandstone, classification of, 447. 
Lower division, 448. 
Old Red Sandstone, Middle division, 448, 
449. 
Upper division, 449. 
Oligochcieta, 292, 293, 318, 355, 356. 
Omo, River, 620. 
Omotepe, island, 639. 
Onagracejfi, 171. 
Onega, Lake, 583. 
Ontario, Lake, 522, 625, 623, 629. 
Oolitic rocks, 454, 455. 
Orange River, 566, 650. 
Orbe, River, 594. 
Ordain, Loch an, flora of, 209. 
Ordnance Survey, 3, 7, 8, 14, 15, 18, 19, 
26. 
Origin of Lake Survey v/ork, 1. 
of Scottish lacustrine fauna and flora, 
308. 
of Scottish lochs, biological evidence as 
to, 304. 
Oring-nor, 604. 
Orinoco River, 639, 640, 650. 
Orkney, deposits in small lochs of, 267. 
Orta, Lake of, 590. 
Orthotrichacecie, 187. 
Ortoire, River, 361. 
Oscillations of lake-surfaces, 29-90. 
Oscillatoriaceffi, 358, 389, 649. 
Ossian, Loch, freezing of, 140. 
Ostenfeld, C. H., 386, 401. 
Ostracoda, 317, 355, 404. 
Ostwald, W., 407. 
Ottawa, River, 627. 
Otterston Loch, flora of, 173, 176, 182, 
254. 
Oued Igharghar, 550. 
Miya, 550. 
Rhir, 526, 550. 
Oughter, Lough, 579. 
Outer Hebrides, geology of, 439, 461. 
Owen's Lake, 557. 
Owskeich, Loch, freezing of, 140. 
Oxara, River, 598. 
" Ox-bow" lakes of Mississippi, 636. 
Oxus, River, 529. 
Oxygen in lakes, 125, 154, 155, 294. 
in sea- water, 154. 
Packard, — , 634. 
Padarn, Llyn, 576. 
Pagade, Lake, 621. 
Paito, River, 640. 
Palestine, 545. 
Palic, Lake, composition of water of, 151. 
Palmellaceffi, 303, 332. 
Palti, Lake, 539. 
" Pampas salinas," 569. 
Panama Canal, 639. 
Pancake ice, 116. 
Pangong Lake, 538. 
Panuco, River, 561. 
Pao, River, 640. 
Parana-Paraguay River, 639. 
Parras, River, 562. 
Parsons, James, 8, 27, 31, 95. 
Pasquier, L. du, 596. 
Passarge, Seigfried, 390, 391, 566. 
