ARTICLES 



ey 



AVERAGE DATES (RECKONED IN DAYS SINCE FEBRUARY) OF 

 FLOWERING OF EACH GROUP IN SUCCESSIVE YEARS. 



1 According as March i records of Oxalis and S. viminalis are included or ex- 

 cluded. 



* According as March i record of Potentilla included or not. 



• Only one species recorded at home. 



AVERAGE DATES ON COMBINATIONS OF GROUPS. 



and April), D,E (May), A,B,C,D,E (March, April, May) and 

 F,G,H (June, July, August). Except for the inversion of 

 F,G,H to the other curves in 19 16 and 191 7 — as remarked 

 above — for the fall instead of rise of A,B,C from 1913-14, and 

 the fall instead of rise of D,E from 191 2-1 3, all the curves 

 are approximately parallel ; and we claim this final demon- 

 stration of parallelism as a conclusive justification for 

 utilisation of Wild Flower Society data according 

 method as above described for the construction of 

 logical curves. From Chart III we learn that, as 

 forwardness or backwardness, the eight years studied 

 arranged as follows in descending order : 

 For the three spring months — 

 1918 



the 

 to our 

 pheno- 

 regards 

 can be 



.p,6| 



I9IS 



I9I4I 



191 3 

 1912 



and for the summer months — 



1919 



1917 



I9i8-i4-i9-i3-i2|_^^_^g 



