THE MILLARDETIAN PERIOD 85 



It will be seen from the above that Rostrup, the phyto- 

 pathologist, was distinctly of the Millardetian period, 

 though, like his European contemporaries, Hartig, 

 Sorauer, and Frank, he brought to his work a training 

 and point of view fashioned and fixed in the atmosphere 

 of the Kiihnian period. He began officially his profes- 

 sional career as a pathologist in that year which marks 

 the beginning of the Millardetian period. His text- 

 book on plant pathology appeared during the very last 

 years of the period (1902). 



Rostrup's contributions to phytopathologic science 

 consist not alone in published papers. He has left behind 

 a corps of enthusiastic and well-trained young patholo- 

 gists, his students, who are carrying forward with re- 

 markable energy and brilliancy the work he has so well 

 established. The most noted of these is his successor at 

 the agricultural college of Copenhagen, F. K^lpin Ravn. 



There were during this period but two other plant 

 pathologists in Denmark who, according to Lind 

 (1913 : 25), deserve to be mentioned with Rostrup. 

 These are P. Nielson and J. L. Jensen. Both were 

 noted for their practical applications of Rostrup's ideas 

 to the control of plant diseases. Jensen is especially 

 noted for his investigations on the control of cereal 

 smuts by the hot-water method and on the control of 

 the late blight of potatoes (Ravn, 1917 : 1-4). 



Scandinavia produced during this period another 

 plant pathologist of eminence and a striking type of 

 pathogenetist in Jakob Eriksson of Sweden. As he is 

 still living the facts regarding his early life and training 

 are not available in a published biography. His contri- 

 butions show, however, that he was a contemporary of 



