WATTERSON: EFFECT OF CHEMICAL IRRITATION 301 
ical use of the carbohydrates supplied to it, we can interpret this 
action as a stimulus which causes the fungus to transform more 
of the food material into its own substance, and less into waste 
products such as oxalic acid, while at the same time the respira- 
tion remains relatively unchanged. 
TEACHERS COLLEGE, COLUMBIA UNIVERSITY. 
TABLE I. 
Kunstmann apparatus. 
Sterigmatocystis nigra. 5 per cent. sugar solutton. 
A= Normal. B-=average of two cultures to which .004 
per cent.* or .00049 normal (gram equivalent) ZnSO, has been 
added. Temperature 28—30°C 
Weight of Fungus. | CO, | Ratio, =| Time, 
ee. 5364 | I | oy on 
ae) 597.6 | 392.5 pes a 
My | A 398.5 | | 1.13 3 
| 8B 607.1 | 755 mist a 
wae A 479-7 705 1.46 4 
| B 805.1 1185 | aes’ « 
as) A 480.8 | 415 — + 
Paes 783.7 Pag | 56 é 
- he ae 533-6 465 i 
easel oR. ol 875.6 780 sa 
Taste II. 
Pettenkofer apparatus. 
ame as in Table I, except that B = average of three cul- 
tures to which .o04 per cent.,* (.00049 normal) ZnSO, has ous 
added. Temperature 20~24° C. 
Weight of Fungus. CO, state BS scsi 
ea 0 70 7 days 
B | 1138.1 | 987 (36 “ 
ue ay oa 673.6 768 1.14 7 
B | 888.0 888 _ « 
VIII he 885.5 1173 1-3? 7 
B 1086.6 1143 1.05 6“ 
IX.| A 1056.0 97 - | 
B 1237.2 | 1036 83 és 
2 A 715 936 1.30 5 
ae ee 1327 | ee ee 
* Calculated as anhydrous salt. 
