MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



467 



Taiile II. — Itoxhoru dhlrici, upper Srlnnjlkill. 

 (Results in parts per 10(1.000.] 



Date. 



Nov. 25 . . 



Dec. 5 . 



Chlorine. 



Oxygen con- 

 auniod. 



Mcau. I 



Jan. U.. 



i:!.. 



21.. 

 Feb. 7.. 



17 .. 



20. 



27 .. 

 Mar. 10 . . 



17 .. 



21 .. 



31 .. 



Apr. 7 . . 



May 5 . . 



15.. 



I 



I 

 23.. 



30.. 



June 13 .. 



1 

 23 ..I 



30.. 

 July 17 . . 



31 ..[ 

 [ 

 I 



Average.! 



.40 

 .37 



lo.'ii 



.iOO 



.22 



. 36 ' ) 

 .31 I 



.29 I ^ 

 .27 5 



. 28 ! ( 

 .25 j 5 



•23 U 

 .23,5 



.23 I ( 

 .28 j $ 



.27 ' ) 

 .28 A 



.25 ! 

 .27 ; 5 



.405 



.23 ( 



.21 A 



.29 ') 

 .27 1^ 

 .26 'J 



.14 |) 



.18 |5 



.27 '! 

 .27 15 



.25 1 

 .30 ■ 

 .32 

 .32 



.30 I) 

 .31 i 



.29 I 

 .33 ,5 



.47 » 

 .45 ii 



.43 I) 

 .42 J 



.47 ) 

 .50 5 



.50 

 .48 

 .45 

 .4B I 



.220 



.273 

 .160 

 .270 



.308 



.305 



.310 



.460 



.425 

 .485 



< 0.20 

 \ .22 



Mean. 



Free ammonia. 



A'lbuininoid aram'onia. 



Tin Glass 

 tube. tube. 



•0.210 



I .180 



.040 

 .180 



> .140 



? .115 



I .055 



I .145 



.065 

 .050 

 .050 



}■- 



V .070 



I .110 



I .060 



I .100 

 I .130 



.0062 

 .0054 

 .0069 

 .0061 



.0018 

 .0007 

 .0000 

 .0000 



0. 0027 



. 0006 

 .0058 



Mean. 



.0023 



100 CO. 

 deter- 

 mina- 

 tions. 



\ :ll\ 



.170 



.119 



.0042 

 ,0015 



. 0000 



. 000.1 



.0027 



.0019 



.0022 

 .0020 



.0050 



.0052 

 .0060 



.0047 



.0030 

 .0023 



.0023 

 .0012 

 .0000 



. 0000 



.0005 

 .0006 



.0007 



.0018 

 .0023 

 .0005 



.0000 



.0006 



.0000 



.0004 



.0005 

 .0007 



.0037 



.0062 

 .0002 

 .0053 

 .0065 

 .0054 

 .0027 

 .0021 



.0010 



.0000 



. 0000 



.0006 



.0016 



.0018 

 .0033 

 .0010 



.0000 



Tin Glass 

 tube. tube. 



0.0130 0.0133 



.0159 

 .0107 

 .0122 



.0194 

 .0099 

 .0034 

 .0062 



.0192 

 .0059 



.0060 



.0005 .0055 



.0014 



.0012 



.0014 

 .0014 



.0044 



.0105 



.0080 



.0103 

 .0102 



.0217 



. 0072 

 .0086 



.0036 



.0078 

 .0189 



.0083 



.0055 



.0061 



.0072 

 .0039 



.0227 



.0094 

 .0218 

 .0070 { 



.0046 



! 



.0054 I 



.0083 



.0054 



.0074 

 .0066 



.0180 



Mean. 



0.0132 



Nitrogen as 

 nitrates. 



• 0. 075 



.090 



1 .090 



; .120 



. 150 



( .180 



.0079 

 . 0036 

 .0159 

 . 0102 

 .0122 

 .0083 

 .0192 



.0092 



.0055 



.0062 



. 0056 



. 0231 



.0094 

 . 0205 

 .0068 



.0053 



.0055 

 .0094 

 . 0067 J 



( .130 

 \ .108 



C .084 

 ) .088 



.100 



C .080 

 \ .080 



C .100 

 [ .100 



J .000 

 i .090 



Mean. 



Bacteria in one 

 cubic centimeter. 



Mean. 



. 0. 085 



r 3,260 11 

 [ 1,950 I 



( .07 

 I .09 



.090 

 .090 



.090 

 .090 



.090 

 .090 



.060 

 .060 



.119 ' 



.086 



.100 



.080 



.100 ! 



.090 



.080 



.090 



.090 



.090 



3,260 

 3,230 

 2. 1.50 

 1,950 



5,010 

 5,960 

 6,400 

 4,750 



18, 200 

 26, 900 



30, 500 

 35, 800 



2,200 

 1,900 



1,400 I 



1, 950 



2, 350 



5, 750 1 



1. 750 ' 

 1,750 



550 

 450 



4, xm 

 4,580 



2,600 

 1,010 

 2,750 



460 

 355 



1,640 



l,28ll 

 1,370 



1, 380 

 940 



5, 528 



I 22, 550 

 ^33,150 

 } 2,050 

 I 1,675 

 ? 4,050 

 I 1,750 

 I 500 

 I 4,435 



( 2,320 



I 480 



i 1,430 



'■ 1,100 



070 I 



C .070 



) .070 



< .040 



) .040 



.070 

 .070 



.054 

 .054 



.050 

 .050 



\: 



.0089 



;{ 



.060 

 .060 



.080 

 .060 



I .070 



.040 



3, 170 ) 

 2,280 S 3,007 

 3, 750 I ) 



{ I 



1,880 

 010 



.0084 



I .050 



I .065 



I .060 



I .070 

 \ .060 



I 



( .040 

 X .0<0 



5,540 

 5,160 



890 

 650 



250 

 160 



590 

 360 



560 

 460 

 410 



1,610 

 2, 030 



500 

 GUI 



1,945 



5,350 



477 



I 1,835 



}• 



040 



.078 



4,128 



