I04 British Uredincce and UstilaginecE. 



proved by Wolff to be quite useless. With regard to 

 temperature, a series of experiments made by Schindler * 

 shows that the teleutospores of T. tritici will withstand a 

 dry heat of 65° C. before altogether losing their power of 

 germination ; but with moist heat they were sterilized 

 between 45° and 50° C. Cold, on the other hand, had little 

 effect upon them, even after exposure to —icf C. for a 

 prolonged period. 



* Schindler, " Ueber den Einflnss verschiedenea Temperaturen auf die 

 Keimfahigkeit den Steinbrandsporen," " Forschungen auf Geb. der Agrikultui- 

 physik. bd. iii." (i88o), pp. 288-293. 



