AND HORTICULTURE. 59 
necessary to improve the method of controlling, as 
previously stated. 
If all the above enumerated conditions had been duly 
attended to during the experiments, it is very probable 
that the increase per cent. for the roots would have been 
about the same as for the crops, in addition to the improve- 
ment in the quality of the roots. 
It is a great pleasure to me to express to the professors 
and teachers at Durham College of Science, England, my 
best thanks for all their kindness in assisting me, but 
especially to Mr. R. B. Greig, who has given me so much 
of his valuable time ; and to Dr. Thornton, who helped me 
with the arrangement of the electric motor and its adapta- 
tion for my purposes. Mr. Greig having been transferred to 
the University of Aberdeen, Prof. Gilchrist had the kind- 
ness to allow the experiments to be continued, and Mr. 
Bryner Jones undertook the onerous task of supervising 
ithe experiments and sending me the results. For all this 
I beg to express to them-my best thanks. 
To Dr. Pringsheim, to whom I stand in such great 
obligation, not only for the indefatigable care he devoted 
to the experiments and to their carrying out at Breslau, 
but also for the great kindness and hospitality shown me 
by Mr. and Mrs. Pringsheim during my stay in Breslau, and 
particularly at Kryschanowitz, I am very happy to express 
my sincerest thanks. 
It is also a pleasant duty to me to express my deep 
thankfulness to Baron Adelsvard for his goodwill and 
assistance in placing his land at my disposal for the experi- 
ments. I am all the more grateful to Baron Adelsvard, as 
he gave me a conscientious and active assistant in the 
person of his skilled and interested manager, Mr. Knut 
Tillberg, who carried out and supervised in an able 
manner the experiments, and also provided me with all 
necessary workmen for my purpose. 
