20 AMERICAN JOURNAL OF BOTANY , [Vol. 8 
8A. Same nitrogen source, medium with i percent glucose 
Culture 
Total 
Wt. of 
Mg", per 
Mg. Loss 
or Gain, 
Percent 
Growth 
Mg. N 
Medium, 
100 Gr. 
Average 
Gam 
No. 
Species 
Found 
Grams 
Medium 
ICQ Gr. 

Check 
Ster. 
25.095 
147.70 
16.991 ^ 
— ■ 
Check 
Ster. 
25.499 
148.00 
17.229 
^17.178 

Check 
Con.* 
25.529 
147.45 
17.314. 
I 
Chlorella vulgaris 
(+) 
26.774 
147-55 
18.145 ^ 
I 
Beyr. 
(+) 
(+)* 
27.369 
147.50 
18.555 
^ 18.272 
+ 1.094 
6. 
I 
26.774 
147.80 
18.II5 ^ 
2 
Stichococcus sp. 
( + +) 
26.180 
147.30 
17.773 
2 
( + +) 
(++)* 
23.009 
147.15 
15-636 
' 17.417 
+ 0.239 
1.4 
2 
27.822 
147.65 
18.843 
5 
Chlorella (?) sp. 
+ + + + + 
27.161 
147.20 
18.452 
5 
+ + + + + 
28.658 
147.75 
19.396 
> 18.973 
+ 1.795 
10. 
5 
+ + + + +* 
28.195 
147.85 
19.070 ^ 
6 
Scenedesmus (?) sp. 
+ + + + + 
27 4.q6 
147.80 
1 8.604 
6 
+ + + + + 
24452 
147-85 
16.538 
> I7.9II 
+0.733 
4.2 
6 
+ + + + + 
27.496 
147.90 
18.591 < 
II 
Chlorella (?) sp. 
+ + + + + 
27.358 
148.10 
18.473 
II 
+ + + + + 
27.037 
148.15 
18.250 
18.293 
+ I.II5 
6.5 
II 
+ + + + + 
26.897 
148.15 
18.155, 
7 
Protococcus sp. 
+ + + + + 
28.377 
148.10 
19. 161 
7 
+ + + + + 
28.992 
148.25 
19.556 
19.303 
+ 2.125 
12. 
7 
+ + + + + 
28.433 
148.15 
19.192 
3 
3 
Protosiphon 
hotryoides 
+ + + 
+ + + 
Lost 
148.35 
147.30 
+0.893 
26.619 
18.071 , 
■■ 18,071 
5-2 
Average all cul- 
tures 
18.320 
+ I.I42 
6.6 
8B. Same nitrogen' source, medium with i percent mannite 
Culture 
Wt. of 
Mg. N per 
Mg. Loss 
Growth 
Total Mg. 
Medium, 
100 Gr. 
Average 
or Gain, 
No. 
Species 
N Found 
Grams 
Medium 
100 Gr. 
Check 
Ster. 
25741 
146^.95 
17-517^ 
Check 
Ster. 
25.571 
148.10 
17.266 
' 17.091 
Check 
Con.* 
24.184 
146.65 
16.491 ^ 
I 
Chlorella vulgaris 
+ + + 
25-458 
146.65 
17.360' 
I 
Beyr. 
+ + + 
26.350 
146.65 
17.968 
' 17.587 
+0.496 
I 
+ + + 
25-033 
143.60 
17.433 , 
2 
Stichococcus sp. 
+ + 
24.467 
146.80 
16.667 
2 
+ + 
24.000 
146.90 
16.338 
> 16.466 
-0.625 
2 
+ + 
24.113 
26.746 
I47-IO 
16.392 1 
5 
Chlorella (?) sp. 
+ + + 
147.10 
18.182 
5 
+ + + 
24.368 
147-15 
16.560 
> 17.243 
+0.152 
5 
+ + + 
25.047 
147-45 
16.987 
6 
Scenedesmus (?) sp. 
+ + + 
26.307 
147.50 
17.835 
6 
+ + + 
24.269 
147.55 
16.448 
' 17.403 
+0.312 
6 
+ + + 
26.449 
147.55 
17.926 
II 
Chlorella (?) sp. 
+ + 
21.933 
147.75 
14.845 " 
II 
+ + 
22.258 
147.80 
15.060 
14.891 
— 2.200 
II 
+ + 
21.848 
147.95 
14.767 , 
7 
Protococcus sp. 
+ 
24.807 
147.85 
16.779 1 
7 
Protosiphon 
+ 
25.840 
148.10 
17.448 1 
I7.II4 
+0.023 
3 
+ + 
25.812 
148.15 
17.423 1 
3 
hotryoides 
24.099 
148.20 
16.200 / 16.812 
— 0.279 
Average all cul- 
tures (omitting 
species no. 11) 
17.103 
+0.012 
