264 



The Ottawa Naturalist. 



[March 



None of the samples contained more than traces of solid 

 substance held in suspension. Sample No. 2 however, alone 

 gave indications of any dust particles. 



Sample No. 2 contains slightly more orp^anic matter 

 than either of the others as shewn by the quantity of albuminoid 

 ammonia obtained by distillation of the melted ice. On igniting 

 the very minute residue left after evaporating the samples to 

 dryness, samples No. i and No. 2 scintillated indicating thereby 

 the fact that these samples contain minute particles of solids in 

 suspension. 



No such phenomenon was observed in the case of No, 3. 



On the who'e I may repeat that although all three samples 

 are perfectly safe for domestic use, sample No, 3 is on the whole 

 to be preferred. 



Tabulated Results of AiN'alyses of Ice from near Ottawa, Ont. 



Results given in Parts 

 PER Million. 



Total Solids 



Phenomena on ignition . 



Free ammonia 



Albuminoid ammonia 



Albuminoid ammonia after. . 



filtering through paj^er 



Oxygen consumed by organic . 

 matter in 4 hour.s at 80" F. . . 



Designation of 



Sample. 



I 



Gatineau Point 



above R.C. Ch. 



Reference No. 



121 :;. 



Chlorides 



Bacteria per cubic centimeter. 



Colour of melted ice 



Column of 2 feet 



(Loyibond's Scale) 



9.6 



Scintillates. 



0.070. 



0.085 



0.066 



0.246. 



Trace. 



None. 



0.40 Blue. 



0.45 Yellow. 



0.00 Red, 



Designation of 



Sample, 



II 



Gilmour's Point 



Oitawa River. 



Reference No. 



1216. 



193 



.Scintillates. 



o.oSo. 



0.103. 



0.085. 



0.240. 



Trace. 



One in 3 c. c. 



o. 36 Blue. 



0.50. Yellow. 



0.00 Red. 



Designation of 



.Sample, 



III 



Above Chaudiere 



Falls, 500 feet 



from shore. 



Reference No. 



1217. 



12.3. 



No I lackening. 



0.068. 



0.065. 



0.058. 



0.000. 



Trace. 



None. 



0.55 Bine. 



0.65 Yellow. 



0.00 Red. 



