BOTANICAL GAZETTE 
TABLE V 
VARIOUS TREATMENTS PRODUCING EXTERNAL SHEATHS ON ALGA CELLS, TOGETHER 
COMPARATIVE TREATMENTS FAILING TO PRODUCE SUCH SHEATHS 
[MARCH 
MEDIUM EMPLOYED, NON-TOXIC 
UMBER OF TESTS IN 
3 DISTILLED WATER CONTAINING WHICH SHEATHS WERE 
Zz 
2 ALGA EMPLOYED Suspe nsoids and ‘Solutes and Notes* 
ir XI. \- 
a mate comeentra mate concentra-| Formed | Not formed 
iS) » Pp tion, p.c. 
1a | Spirogyra Gold, 90.0 | NaOH, ee te eee E; sheaths formed 
longatat o.o2t within 17 hours 
1b | Do., from do. OO ie te 2 
culture in 
0.1 p.c. 
Crone’s 
sol. 7 
days ol : 
1c | Spirogyra do. do. Pelee fe ae oe ; within 4 
decimina§ Sheaths fo’ 
within 17 hours 
1d | Oscillatoria\| do. do. 1 (?) I E; a few filaments 
in one culture 
showed | slight 
sheaths when 
transferred to 
p water; no 
sheaths appar 
ent in gold so- 
lution. Usual 
movements ob- 
te | Hormidium do. Ai le es Pon Ss ee a et 
2 ] is0mt, 40.01 N@OM. 13. & 2 ek ee es ae ee 
ongata 0.01 
96 De a a a Awl, 6.612. 65: 2 D; many filaments 
INaOQH, 0.029 
30 | S. dectaina toe gee I G 
4a | S: foams lo Ri Ol... 2 G 
Nai 
0.01 
4b. 1 Sleiman {2 FETS Sa i Uae 2 G 
§- ) Sitoag@a TS pe a, ee I D 
0.02t 
68) | D8. es Oe NAO oe. I D 
0.01 
6b | S. decimina |............ vg ak Cea ae No — eae 
i 
Renee colorless 
ones appea 
n second day, 
when rags 
mostly 
76 | S. lonpaig 1 MeOH be says 2 G, in one culture 
0.029 sod 
7b | S.decimina |............ "ae ee I D 
S Jongate og as Nat eta ae 2 G 
°.o1§ 
