55 



Summary of presentation-times. 



Thf intluence of the tempcratiire and the time-factor is 

 vcry clcar hère. From 0° C. up to 25° C. the prosentation- 

 time shows no altération due to the time of preliminary 

 warming, At 80° C. the presentation-time decreases when 

 the preliminary warming is increased. From 85° C. to 



i) After 8 hours' preliminary warming. 

 2) After 18 hours' preliminary warming. 



