356 Hoyt: CULTURES OF SPIROGYRA 
TABLE III, continued. 
Duration a 
-abediok Treatments Additions cohen, - aaa 
days | 
] 
14 do. Colloidal Pt sol. | 
: to double vol.) 26 Gp 
15 do. Filter er 10, ¢ Pd, D 
16 do. Cotto ;2 D, D 
17 do. Kaolin ak D,D 
18 do. Quartz sand i, z DD, 
19 do. Pigoes trace a D 
20 do. do., exce: 5 D 
2I do. do., ahanaaice 23, 56 E, Eg 
22 |Shaken with chalk, decanted after| 
22a \As 22, decanted after 10 days — 9, 10 G, Pd 
bY seein with wood charcoal, de- 
nted — 53 r 
23a Abe 23, decanted after 4 days — 30 G 
24 |Shaken with aga decanted after 
sever i day: 44 Gp 
25 #=|Untrea : Lime, abundance| 2 E 
26 do CaCle, O 0.4 p.¢ D 
27 do Agar sticks 20 E 
28 do. Agar, not hard 
enin: I D 
29 do Agar, I ~.c., alga 
ons 54 G 
30 do Agar, 2 p.¢., as 
29 ra) 
31 do hagnum mo 23, 23. E, E, Pd 
32 do Nitella sediment | 48 G 
33 do og 
5 D 
34 do. I D 
34a |Water from 34, alga removed Alga bro by 
resh material 
pe sek jar} 1 D 
34b |Water from 34a, alga removed do. 2 D 
34c |Water from 34), alga removed do. 15 9 
34d |Water from 34c, alga removed do. 44 E 
35 |Treated with Ulothrix,} removed 
after 28 days do, 22 te 
35a (Untreated (control to 35) _ _ I D 
36 Mele from stock Shack cul- 
ps 52, 47,9» 4 E, Eg, G, 
Gp 
37. |Water from Nitella culture — 53,9 E,E 
* The condition of the plants is indicated as follows: E, excellent; G, good; P, 
poor; D, dead. A friana oe: of ieee a a oe be in i that denoted 
by each of these letters—as, Eg nt and good, etc- 
Where the experiment was eee ted, each of the several notations given refers to a 
single experiment. The numbers in the preceding column (duration in days) refer 
to the experiments in the same order as do the letters; thus, the first letter denoting 
condition and the first number denoting duration both refer to the same experiment, 
+ Ulothrix killed except in center of mass. 
