14 
‘APPENDIX : 
Yields of the individual cultures, generally five of a kind. The 
number of weeks stated in connection with each experiment refers 
to the time elapsed since the original isolation of the two strains. 
For cultural conditions see page 3. 
EXPERIMENT I 
STEINBERG: GROWTH OF ASPERGILLUS NIGER 
Kahlbaum’s “Zur Anal.’’ MgSO..7H2O used; 1 week 
















































wo VO } 
No zinc o.r mg. Zn/L No zinc o.r mg. Zn/L 
* 0.910 gram 0.902 gram 0.509 gram 0.796 gram 
C2100 co 0.868 * O;5750-%<" OBR 
ere 9 Wa 0.894 “* O5ah- 5 0.809.“ 
0.289225 Go10 2 0.009 oor 6.840527 
O20i 2" C944. 5" 0.575": Oi827 °3*! 
Se Oe en G08 Fey: | GGG cat, 0.811 “ 
EXPERIMENT II 
Kahlbaum’s “Zur Anal.”” MgSOx.7H20 used; 3 weeks 
Wr 3 ie ‘ . ; 
No zinc o.or mg, Zn/L No zinc o.or mg. Zn/L 
0.302 gram 0.602 gra 0.516 gram 0.806 gram 
0.265 : O70 °°" Sek 0.830 °°" 
520 0.562." 0,540: ** Ogg 
0.430. 7" S525 4° 0.409 “ e604! 
0.335 0.554 * 0.393“ 0.732“ 
O317 <or apts 0.480 ‘ 0.781" 
EXPERIMENT III 
5 weeks 
We 
No zinc | 0.001 mg, Zn/L 9,05 mg. Zn/L oz mg. Zn/L 1.0 mg. Zn/L 
| * 
0.243 gram | 0.335 gram 0.627 gram 0.861 gram 0.891 gram 
0.246 : | O02" 0.750. 0.862 " -923 ne 
sentiee 0.397 “ C705. 7 0.843 0.047 “ 
0.217 . | 0.507 ‘eé 0.760 “sc 0.890 “e 0.904 “ 
0.205 O.A6r :** O7ag 0.020..." ODis. = 
Pe a re sO eTe 0.915“ 

* Accidental zinc culture. This phenomenon has been previously discussed (6). 
