174 Canadian Record of Science. 



FLUCTUATIONS IN HARDNESS. 



The average hardness for November was 4 . 70 degrees 

 Wanklyn, a little higher (5.12) in December, but lowest 

 in January, the average for that month being only 3 . 77 

 degrees. In February the hardness was about the same 

 as in November, namely 4. 72, while in March the maximum 

 was attained, the average for that month being 6 .07 degrees. 



FLUCTUATIONS IN CHLORINE AND SOLIDS. 



As regards chlorine, the average was 0.264 grains to 

 the gallon in November, but instead of rising in December 

 like the Hardness, it fell to 0.243, became . 235 in January 

 and rose in February and March to 0.28 and 0.325 respec- 

 tively. 



The solid residue varied in a similar manner, sinking 

 from an average of 6.83 grains per gallon in November 

 through 6.70 in December to 5.23 in January, and then 

 rising as regularly through 7.12 in February to 8 . 82 in 

 March. Thus we see that the average results for the 

 opening and closing months of the period were high, while 

 those for January, the central month, were the lowest. 



SUMMARY. 



To sum up the results, the following was the average 

 proportion of foreign matters in Montreal water during 

 the time covered by the analyses : — 



Hardness Mean of 51 Determinations 4.63° Wanklyn 



Chlorine " "48 " 0.26 grs. per. gal. 



Solids " "46 " 6.55 part per gal. 



Free Ammonia " "9 " 0.0031 parts per mill. 



Albuminoid 



Ammonia... " " 11 " 0.0194 « « " 



These results are calculated from the actual analyses and 

 differ somewhat from those given by computation from the 

 monthly averages, for the reason that the same number of 

 analyses was not made each month. The average obtained 

 in the latter way is, perhaps, the more accurate, as it tends 



