71 



partial temperature range, for Diplodia (72.2 per cent.), it 

 occurs higher in the ran re for P cyst 1b - (77.7 per rent) 



d it lies still higher in the range for Phytophthora 

 (P0.5 per cent.) and Phomopsis (80*2 b). 



By these rarioue criteria it appears that t><e four 

 relative graphs under discussion (figs. 6 and 7), althou they 

 are alike in a very general way, are yet unlike as to details 

 of for . Wftile two or three of * ay resemhle one another 

 more than they resemble the remainder of the four, yet the four 

 graphs do not fall into the same grouping by any two of the 

 criteria he<-e employed for their comparison. Of course com- 

 parisons like the ones just rcade oight he instituted hetween 

 different funri with reference to any other time period than 

 the one here employed ; only the mean rates of enlargement 

 for the second 24-hour period after inoculations are here con- 

 sidered. 



fLATIOU OF GROWTH RATE 

 TO AGE 0? CUT. 



General considerations 



It has ">-»er emphasized that the growth rates as meas- 

 ured in the work here reportr-d differ not only for different 

 fungi with the same maintained temperature and fc different 

 maintained temperatures with the sai>:e fungus, but also for 

 different consecutive observation periods with the same fv 

 -■-■* and same maintained temperature, and it has also been point- 

 ed out that these last differences in growth rate must be re- 

 garded as due to progressive alterations in the internal con- 



6 5 



