32 BOTANICAL GAZETTE [JANUARY 
Table XI) does not show acceleration. It was thought that this was 
due to too strong solutions, hence the experiment was twice repeated 
with the concentrations as dilute as /1o0000, as is seen in Table XI 
and fig. 21, but no very decided acceleration was obtained. This is 
contrary to the results obtained by RicHarps (34), who found that 
ZnSO, was a most powerful stimulant to growth in fungi. ONo (32) 
and RICHTER (35) also report very strong stimulatioa with zinc sul- 
fate. These observations correspond more nearly to my results 
obtained with soil. 
It is very interesting to note the relatively small reduction of 
toxicity by the quartz in ZnSO, as compared with silver nitrate. 
TABLE X 
ZNSO, SERIES IN SOIL. OCTOBER 21-NOVEMBER 18, 1905 
Rot | 8 | 8 |e | |e | | 
sol. | ro0000 | 50000 25000 | 10000 | I0000 | 10000 | 10000 
Average length of sprout, cm ..... 18.76 | 19.28 | 18.86 | 19.56 | 19.60 | 21.42 | 20.60 } 19-50 
Total t transpiration, Gis does 70.00 | 67.90 | 71.20 | 75.50 | 76.80 | 76.80 | 75.20 | 72-59 
Total green weight, mg .......... 905 847 810 857 920 049 890 890 
Total dry weight, mg............ 04 95 100 99 97 
a ee) ae) ee ee 
10000 | I000 | 1000 | I000 | I000 100 100 100 
Average length of sprout, cm ..... 18.28 | 16.20 | 15.42 | 12.72 | 10.30 | 10.12 7.14 | 4:9 
Total piration, gm........... 64.60 | 56.90 | 43.80 | 29.20 | 21.90 | 21.40 | 21. 6.7 
Total green weight, mg...... ecee 748 677 601 310 250 196 169 76 
Total dry weight, mg ............ 06 87 17 yo 62 55 44 31 
TABLE XI 
ZNSO, SERIES IN SOLUTION. OCTOBER 14—NOVEMBER 14, 1905 
Nut. n n Pie 5 n 3n SR ees 
sol. | 100000 50000 | 25000 | 10000 | I 19900 | I 
Average length of sprout, cm..... 13.20 | 13.85 | 13.83 | 14.70 | 15.25 | 12.77 | 12.20 | 11-45 
Total transpiration, gm........... | 30.80 | 32.70 .50 | 32.30 | 35.90 | 29.40 | 29.20 | 29-79 
Total green weight, mg.......... | 29 740 746 782 048 567 527 
Total dry weight, mg............ | 89 gr 04 100 104 80 79 
on n 2n 4n 5n 6n 
10000 Tooo 1000 1000 1000 1000 1000 
Average length of sprout, cm.............| | 28.47 | 10.57 |. 9.10 5.07 | 5-02 | 4-57 
Total transpiration, gm. 26.30 | 23.80 | 21.80 | 22.40 | 21.80 | 18.60 | 15-49 
Total =. weight, mg 445 447 354 315 i 
Total weight, mg 7 17 59 5 
