MISS S. LONGMAN ON THE DRY-ROT OF POTATOES, 137 
The experiments lead to the conclusion that the method of heat-sterilization 
employed successfully in various cases of “seed” infection, such as barley 
infected with smut (Heald '08), is useless in the case of dry-rot. 
TABLE I.— Heating Experiments. 
(+) signifies living. (—) signifies dead. 
| Effect of Temperature. | 
| Temp. | on | gé | 
| Centigrade. | Potato. | Fusarium. | 
- 415 | 04 (+ | 
| 425 | GC) | Œ | 
| Infected tubers 51 | (+) | (+) 
| | (1). heating gradually | 52 | (+) | (+) 
during 1 day 58:5 | (+) (+) 
| up to: 57:2 | зоше аПуе | (+) 
| 61 (—) | (+) 
615 | (-) | (4 
Ist day. 3rd day. | 
Г 515 49% (+) (+) | 
Infected tubers | 50 50:5 (+) (+) 
intermittently heated | | 517 50 (+) (+) | 
I (2). viz.: а 52 52-5 (+) ui ` 
lst day up to :—> | 51 53 | (+) (+) | 
3rd day up to: | | 54:5 53:5 (4-) (+) | 
` 545 545 (—) (+) | 
| Г 43 (+) (+) 
| Infected tubers 40 (+) (+) 
| LG). heated for J 50°5 (—) (+) 
10 hours 51.5 (—) (+) 
| at Temp. := 54:5 (—) (+) 
| 5 -) | (+) 
