13 
53 
TABLE IV. Activation of magnesium by zinc. 
Nutrient liquid: 50 cm3 of distilled water in a Jena glass apparatus, in which 
dissolved 2% glucose, 0,15 9, ammoniumnitrate, 0,1 % potassiumsulfate, 0,05 0/, 
potassiumchloride, 0,05 % 9 fosforic acid (crystallised), 0,01 0/, manganese sulfate. 
Development after 
NO. Added EEE aa = 
bth. | 3 4 12 days 
1 — Ie — — a 
2 us | te me 2e 
3 — | — — EE 
4 | 0001 mgr. ZnSO,.7 Aq "Germination cs eee 
5 0,01 ” ” ” ? Et == 
6 | 0,001 , MgsO,7Aq | | — ae a 
7 | 0,001 , MgSO,.7Aq-+ 0,001 mgr. || | — — Germination 
ZnSO4 71 Aq 
8 | 0,001 , MgSO,.7Aq-+ 0,001 mgr. | -- — = 
Cadmiumsul!ate 
9 | 0,001 , MgSO,.7Aq+0,01 mgr. |L Ee en ? 
strontiumnitrate 
10 | 0,001 ,, MgSO,.7Aq-+ 0,001 mgr. == ik 5 
HgCl 
11 | 0,005 „ MgSO,.7Aq | EE a ai 
12 | 0,005 , MgSO,.7Aq-+ 0,001 mgr. — + (slight) oh 
ZnSO, eal Aq | 3 | 
13 | 0,005 , MgSO,.7Aq-t+ 0,01 mgr. =- f Germination 
ZnSO,.7Aq 
14 | 0,01 „ MgSO,.7Aq 4 + (slight) 
15 | 0,05 „ » = Germination 2 See rid 
Spores 
16 | 0,1 ” ” ” J 55 niin no +++, no 
spores spores 
LTPP OSes . ” + |+++,beginning} +++, beg. | ++++1, beg. 
sp. formation | sp. formation | sp. formation 
18/05 „ » » “leat beg: iet tn beg: ; 
‚sp. formation | sp. formation rather many sp. 
> oa ey » oe eta he Wen tert att 
spores beg. sp. form. | many spores 
20 | 5 ” ” ” =I nnen + = t 5 ie L it ns 
few spores |rathermanysp. many spores 
| 
