138 
Postscript, 
When working upon the Pirolacee W. Rommet’s paper 
Anatomische Untersuchungen über die Gruppen der 
Piroleæ und Clethraceæ, Heidelberg, 1898, escaped my 
attention; in it the anatomy of the Pirolaceæ is treated of, 
especially that of the stem and root. That paper would not, 
however, have influenced my treatment of the species in ques- 
tion, as the exclusively biological point of view which I have 
adopted in the present paper required an independent, fresh 
description. But Ronsmer’s paper should be mentioned here. 
For the sake of uniformity I give here the respective pages in 
Rommer’s paper: — Pir. rotundifolia, p. 19, Pir. minor, p. 11, 
Pir. secunda, p. 22, Chimophila umbellata, p. 28. 
30—6—1908. 
