To. ee ee 
ig Ur-O7 
PROCEEDINGS 
OF THE 
NATURAL SCIENCE ASSOCIATION 
OF STATEN 
= é 
|. 
mm Vor. VIII. No. 18. 
r 
| 
, 
The regular meeting of the Association was 
held at the residence of Mr. Wm. Allaire 
Shortt, Tompkinsville, with the president in 
the chair. 
In the absence of the secretary Mr. 
was elected secretary fro fem. 
Dr. H. W. Patterson, New Brighton, was 
elected an active member. 
The following paper by Dr. Arthur Hollick 
was read by title: 
Shortt 
SOME COMPARISONS BETWEEN RECENT AND 
PREVIOUS ANALYSES OF OUR PUBI.IC 
WATER SUPPLIES. 
At our meeting of Feb. gth, 1895. I read a 
paper upon the subject of our water supply, 
in which was included a table of comparisons 
between two analyses each of the waters of 
the Crystal Water and Staten Island Water 
Supply Cos. 
These comparisons indicated a serious de- 
terioration in the quality of the latter between 
the date of the first and Jast analysis, whereas 
the former, during about the same period, had 
undergone no important change. 
Recently I was able to secure a number of 
subsequent analyses of the above and also of 
the waters from the New Dorp and Totten- 
ville water supplies. For purposes of com-— 
parison the earliest and latest < praise ots of each 
is given, expressed in parts in LUEEEs, 2 
follows : 
STATEN ISLAND WATER SUPPLY CO 
June 30, 1883 Nov, 19, 1902. 
WRIOFING: .62.05:s)..:.0.02 0.879 39.2 
Lr 9 ..- none 0.0002 
PNUIECALES, Saige « detec 0.0523 0.35 
Free ammonia......,.... none 0,001 
Albumenoid ammonia 0.0014 0.003 
Hardness before boil- 
Min tua vesntervienis'essivic, Ong 27, 19 04 
- Hardness after boiling 3.967 19.04 
ISLAND. 
DECEMBER 13th, 1902. 
Organic and volatile 
MALE sane asensie trace 22.50 
Motel Solids... ciniiae « 13.0 102.90 
CRYSTAL WATER CO. 
Oct. 22, 1885 Oct. 30, 1902. 
AGHTORING 5-5 o12 Soe oie 1.006 0.76 
Nitrites...... none none 
Nitrates. .:)..-:s0s0ses. G1O98G 0.0811 
Free ammonia...... trace 90,0015 
Albumenoidammonia 0.01 0.0035 
Hardness before boil- 
Ith, asthe hs eah G0 9 53 
Husdneseiiox biting 5.0 7.91 
Organie and volatile 
matter. ies .2dares 4.75 3 80 
Total solids ..... ...12 50 13.80 
SOUTH SHORE WATER SUPPLY CO (New Dorp.) 
Jan. g 1899. Oct. 30, Ig02. 
Chlorine ..<. cscs. 1.287 Lg 
PMAtrites.. 2 5 si eit none none 
INGEEA LES bets. Batt Ssa%s 0.185 0.2458 
Free ammonia....... trace 0.0015 
Albumenoid ammonia trace 0.0015 
Hardness before boil- 
ins ethene nO O 6.28 
Hardness after boi.ing12.0 4.67 
Organic and volatile 
Mattel wsssvemu cone 200 3.2 
Total solids.......... 20,2 23.6 
TOTTENVILLE WATER SUPPLY CO, 
Jan. 6, i899. Oct. 30, 1902. 
GhHOrING 3 <a ssivinvesysny 1.190 1.0 
INitrIleS ssc) c xcuiw at teneee DONE none 
Nitrates. ....% sesscase trace 0,0082 
Free ammonia...... . 0.003 trace 
Albumenoid ammonia 0 003 trace 
Hardness before boil- 
IMGs veers reese 
Brgania 
matter :.., 
Total solids ..... 
