1897.] 
Biological Studies in Massachusetts. 
TABLE No. 7: 
Chemical Analyses (parts per 100,000). 
1023 
Number of Ponds and Reservoirs in which 
Diatoms are 
eean 
Occasionally Panton | be- 
above ` tween 100 Be i a 
1000 pr c./1000 per c. 0.1600 per c FC. €. 
tiie Fae | 
Color Oto. eee eS 9 4 
(Nessler Scale) 30 to .60 6 2 | 4 0 
60 to 1.00 6 1 | 5 1 
to 0 1 | 1 1 
xcess of 0 4 2 1 2 
‘closes Ol to .03 8 1 8 2 
04 to .25 8 3 10 2 
5to — 4 2 0 0 
Hardness Ot 5 2 1 3 8 
5to 1.0 7 4 5 2 
1.0 to 2.0 8 0 10 1 
2.0 to —- 7 8 1 0 
Albuminoid 0 to .0100 2 0 2 1 
Ammonia -0100 to .0150 6 1 5 3 
(dissolved ) .0150 to .0200 8 6 | 7 1 
.0200 to —— 8 1 | 5 1 
Free -0000 to .0010 3 2 | 5 3 
Ammonia -0010 to .0030 6 1 10 2 
0030 to .0100 8 5 4 1 
to 7 0 0 0 
Nitrates Oto. 3 3 5 6 
0050 to .0100 11 3 13 0 
0100 to .0200 6 2 1 0 
to 4 1 0 0 
TABLE No. 8. 
Number of Ponds and Reservoirs in which 
the Chlorophycez are 
Chemical Analysis (parts per 100,000). 
Often EE E Usually be- ia 
above above (tween por t 100 ae 
1000 per c. c. per c. c. 500 per c. per ig 
Color 0 to .20 2 5 ve 8 
(Nessler Scale) -30 to .60 2 4 5 1 
.60 to 1.00 1 3 8 ae 
1.00 to — 0 0 2 1 
Excess of 0 i- 3 ARAE | ee 
Chlorine .01 to .03 1 Ae | sa Geen Red 
.04 to .25 0 4 Bo 6 
.25 to — Bi: 2 1 ore 
Hardness Oto .5 0 ae o$ 4 
to 1.0 Eo 4 8 5 
1.0to 2.0 1 $55 Nee 2 
2.0t0 — 3 2 cme 1 
Albuminoid 0 to .0100 0 0 ou 3 
anns 0100 to .0150 . ~ RE E T 
oe eae 3 20 io 7s 
Free 0 to .0010 0 LA a a 4 
‘Ammonia .0010 to .0030 Hea ne 1 13 l 5 
-0030 to . : ae 5 us. | 3 
0100 to APES a eae 0 
Nitrates bea | 8 3.8 ee ree | 
0050 to .0100 Ts eee ay S 
0100 to .0200 ete raa 7 0 
to 3 pA: 1 0 
