

THE JTXPKhlMNTAL DATA 



As previously noted, two diameters of each mycelial 

 disk were measured at 24 hourly intervals during eaob experi- 

 ment. The average of these two measurement* are taker, to 

 represent the average diameter for a given culture at the 

 time cf measurement. From this average diameter at the end 

 of the first 24 hour period, the diameter of the transplanted 

 r-vtting (2.5 mm.) was substracted, and the remainder was taken 

 as the value for the increment of enlargement for this first 



observation period. The difference between the average meas- 

 urement for the end of the first and that for the end cf the 



second 24 hour period represented the increment of enlargement 

 for the second 24 hour pericd. Increments fcr the subsequent 

 periods were obtained in a similar way. All of the culture 

 averages fcr a group of like cultures in + he same chamber 

 (each average derived from two measurements as just described) 

 were finally averaged to give the grou p mean* These group 

 means were taken as relative measures of the radial enlarge- 

 ment for the different fungi, different time periods and dif- 

 ferent maintained temperatures. Such means are usually de- 

 rived from a group of from 6 to 10 duplicate cultures. Ex- 

 amples showing the derivation of the group means from averages 

 of diameter increments of individual cultures are given ir 

 tables I and II. The first column ir, these tv/o tables, gives 

 the maintained temperature, the second gives the number cf t 

 individual cultures in each group. In the following four 

 columns are given the averages from which the group means are 

 to be derived . each of these values ein^ the average of t*o 



