1 8 AMERICAN JOURNAL OF BOTANY [Vol. 8 
6A. Same medium, with i percent glucose 
— 
Check 
Ster. 
27.348 
148.40 
18.429 
— 
Check 
Ster. 
26.203 
148.50 
17.645 
18.056 
— 
Check 
Ster. 
26.943 
148.90 
18.095 1 
I 
Chlorella vulgaris 
+ + + + + 
26.301 
148.35 
17.729 
I 
Beyr. 
+ + + + + . 
26.231 
148.40 
17.676 
> 17.783 
-0.273 
I 
+ + + + + 
26.622 
148.35 
17.945 J 
2 
Stichococcus sp. 
+ + + + 
25.882 
148.45 
17.435 
2 
+ + + + 
25.645 
148.45 
17.275 
> 17.426 
-0.630 
2 
+ + + + 
26.064 
148.35 
17.569 
5 
Chlorella (?) sp. 
+ + + + + 
25.756 
148.35 
17.366 
5 
+ + + + + 
26.762 
148.40 
18.034 
> 17.590 
— 0.466 
5 
J 1 1 1 i_ 
^ ^ ^ ^ ^ 
25.784 
148.45 
17.369 , 
6 
Scenedesmus (?) sp. 
+ + + + + 
26.580 
148.50 
17.899 
6 
+ + + + + 
27.390 
148.45 
18.451 
> 18.226 
+ 0.170 
6 
+ + + + + 
\ 1 \ \ 1 
27 20Q 
ia8 zt=^ 
18 ^2Q 
II 
Chlorella (?) sp. 
+ + + + + 
26.860 
148.45 
18.094 
II 
+ + + + + 
27.363 
148.45 
18.433 
> 18.295 
+ 0.239 
II 
+ + + + + 
27.306 
148.75 
18.357 < 
7 
7 
Protococcus sp. 
26.846 
27.893 
148.70 
148.70 
18.054 1 
18.758 1 
> 18.406 
+ 0.350 
3 
Protosiphon 
+ + + + + 
27.069 
148.70 
18.204 1 
> 18.258 
+ 0.202 
3 
hotryoides 
+ + + + + 
27-265 
148.90 
I8.3II J 
Average all cul- 
tures 
17.998 
-0.058 
Tables 7A and 7B. Results of analyses of mineral nutrient agar cultures of green algae. 
Experiment of 1919. Growth period, lys days. Nitrogen source, ammonium sulphate 
7A. Medium with i percent glucose 
No. 
Culture 
Species 
Growth 
Total Mg. 
N Found 
Wt. of 
Medium, 
Grams 
Mg. N per 
100 Gr. 
Medium 
Average 
Mg. Loss 
or Gain, 
100 Gr. 
Check 
Ster. 
21.385 
148.30 
14.421 ' 
Check 
Ster. 
21.986 
148.80 
14.776 
> 14.462 
Check 
Ster. 
21.190 
149.35 
14.188 
I 
Chlorella vulgaris 
( + ) 
20.729 
148.40 
13.968 ■ 
I 
Beyr. 
(+) 
20.799 
148.15 
14.039 
^ 14.084 
-0.378 
I 
( + ) 
21.148 
148.45 
14.246 
2 
Stichococcus sp. 
( + + +) 
20.561 
148.25 
13.869 ' 
2 
( + + +) 
21.651 
147.95 
14.634 
14.176 
-0.286 
2 
( + + +) 
20.799 
148.30 
14.025 . 
5 
Chlorella (?) sp. 
+ + + + + 
20.380 
148.60 
13.715 
5 
+ + + + + 
20.771 
148.65 
13.973 
13.925 
-0.537 
5 
+ + + + + 
20.911 
148.45 
14.086 , 
6 
Scenedesmus (?) sp. 
( + +) 
20.310 
148.70 
13.658 ' 
6 
(++) 
20.799 
148.60 
13.997 
13.784 
-0.678 
6 
( + +) 
20.366 
148.70 
13.696 , 
II 
Chlorella (?) sp. 
( + + + +) 
20.212 
148.90 
13.574 
II 
(+ + + +) 
21.162 
148.95 
14.208 
■ 13.834 
-0.628 
II 
( + + + +) 
20.450 
149.05 
13.720, 
7 
Protococcus sp. 
+ + + + + 
21.036 
148.95 
14.123 1 
7 
+ + + + + 
20.771 
149.00 
13.940 J 
> 14.032 
-0.430 
3 
Protosiphon 
+ + + 
22.098 
148.95 
14.836 1 
. 14.398 
— 0.064 
3 
hotryoides 
+ + + 
20.827 
149.20 
13.959 J 
Average all cul- 
tures 
14.033 
-0.429 
