r or this work, entrusted to me, the necessary material 

 has kindly been placed at my disposal by the Botanical 

 Museum of the University in Copenhagen and by the 

 Riksmuseum in Stockholm. I have throughout had the kind 

 advice and guidance of Professor E. Warming, and wish 

 to tender my hearty thanks for his great kindness and 

 courtesy. I am also greatly indebted to Dr. C. H. Ostenfeld, 

 Inspector at the Botanical Museum, for the willing help 

 extended to me on several occasions. 



With the exception of figs. 6 A — I and 10, which were 

 placed at my disposal by Prof. Warming, all the others 

 have been prepared by me. The anatomical sketches were 

 drawn with the help of Abbe's drawing-apparatus and reduced 

 to half-size when reproduced. The lens-combination used in 

 drawing is given in the text for each figure, one index is the 

 number of the Zeiss apochromatic, the other that of the 

 compensation-eyepiece. 



The following species have been examined : — 



Pag. 



Primula egaliksensis 169 



— sibirica 176 



— stricta 182 



farinosa var. groenlandica 187 



— nivalis 190 



Androsace septentrionalis 194 



— chamaejasme 201 



Dodecatheon frigidum 208 



