O’Brien: Notes on RESISTANCE OF CERTAIN Func: 171 
accompanied by checks, which gave uniform growth .and are 
therefore not recorded. The cultures were usually examined 
twenty-four hours after they were made, and again within two or 
three days. Results were recorded after the first examination, 
but additions were sometimes made upon later examination. 
The figures in the table indicate the percentage of growth. In 
the case of the mycelium it was found impossible to indicate the 
new growth by exact per cents., hence fresh growth is indicated 
in all cases by (g) which is recorded only where vigorous fresh 
growth appeared on all sides of the bit of mycelium. 
| | Spores | Mycelium 
| Time of Exposure 
" | Tempera- | Time of Exposure in Minutes in Minutes 
| ture °C, | Fungus ee —| DERE BIE 2 
| ooh oe Pome op gee, fee eee 
| | Percentage of Germination Growth 
I} 45 | Botrytis. | all | go | 40 | 50 | 2 | | 
| | Rhizopus. a 4 204 Se aS 
3 Poa | Aspergillus. | 98 98 | 98 | 98 | 80, | 
4 | | Botrytis. [Os eee ee pe 
3 | | Rhizopus, 1so-75| 25 | 20 | 90 | 407°) 
6 | | Sterigmatocystis. | | | | 75 |100| | 
£1 50. | Aspergillus. | 90 | 40 | t0 | 0 | 0) | gs 
8 | Botrytis. | 65 | 2 |xror2|ror2} 2 | 0 0 
| | | |spores!spores{ | | | 
9 | Rhizopus. wa ge aie | Gig Gam tke ee oe ee ae & 8 
spores | | ea ee 
Io | Sterigmatocystis., 98 | 90 | 40 Ce ba ae 
it 52. _ Aspergillus. | go | 80 35 18;8/) 8) | 
12 ' Botrytis. | 20 10 I igi 8 |e) | 
13 Rhizopus. 4-2 pe pe ee, 18,858 1-4 
14 Sterigmatocystis.| all 90 | 80 ° 818) 8) | 
15 53 Aspergillus. | (8; 8) se) | 
16 | Botrytis. ig} 8) 8) | 
17 55 Aspergillus. Seay ee er) oe OO re Tey 
18 Botrytis. | [Pepe Tey y 
19 Rhizopus. | | jo}o}o} | 
= Sterigmatocystis.| 2 Py fc) do Dict | peel Weis 
21} 60 | Penicillium. | 50 |20-5o|10-15| 5 | 5 |g| 8/8 |8/° 
aed 65 | Penicillium. | ee ov Eye \8) 8) 8 18/8 
Certain experiments were omitted, hence blank spaces appear 
in the table. For instance it was found that the mycelium of all 
the fungi except Botrytis gave vigorous fresh growth at 50° for 
the two longer exposures, 30 and 60 minutes, hence it is unneces- 
Sary to try it at lower temperatures. Also Penicillium, both 
Spores and mycelium, gave vigorous growth at 55°, and was, 
therefore, omitted from the experiments at lower temperatures. 
