Page 

 O. 



Oozo, animals in 106-7 



Oxygen, cycle 30 



methods 29-30 



ooze 31. 106-7 



production, factors in 29-30 



P. 



I'edalia feunica, seasonal occurrence SG 

 Plancton, amount, comparison with. 



other lakes 104-5 



comparison of lakes and rivers 104 



distribution, horizontal, irregular- 

 ity in 36-8 



imrestricted 107-9 



vertical 41, 43 



production, factors in 42-4 



variation in 43-4 



reaction to light 46, 48 



species, rt'presentative 45 



Precipitation 13 



Protozoa, distribution, unrestricted.... 108 



environment, relation to 75 



habitat 75 



relation to, oxygen 107 



species, comparison vrith fresh 



water 75, 101 



vitality 75-6 



Page 

 R. 



Rotifers, adaptability 82 



amount, comparison with other 



lakes 104-5 



distribution, seasonal 81-2 



habitat „ 81 



life cycle _ 45 



reproduction 81 



species, comparison with other 



waters 82 



Run-off 13 



Ruppia 74 



S. 



Sarcina, seasonal occurrence 59 



Seepage 14 



Species, new 105 



Specific gravity 18 



Stump Lake, life, comparison with 



Main Lake 54 



T. 



Temperature 24-6 



Thermocline, see Temperature. 



Turbidity 19 



W. 

 Wini 15 



