No. 526] VARIATIONS IN UBOSALPINX 



587 



play a greater part in determining the amount of varia- 

 bility than do the factors dependent upon place. 

 Furthermore, there is a greater difference of variability 

 after four weeks (.272) than after two weeks (.132) 

 have elapsed, just as would be expected if a progressive 

 time change is taking place. The same general result 

 appears also when an average of the four localities is 

 reckoned, as shown in the bottom line of the table, but 

 an examination of the second, third and fourth lines of 

 the table reveals several instances in detail of non-con- 

 formity to tliis apparently general conclusion that time 

 has more to do with determining variability than place. 

 It is apparently safe to conclude, however, that the fac- 

 tors dependent upon time are at least as important, if 

 not demonstrably more so, than those dependent upon 

 space or localitv. 



