Some Accessory Factors in Plant Growth and Nutrition. 245 



Table VI. 



Series. 



W eignt oi set o 



■ 1 Q -nlonf a 



Percentage increase 

 on original weight. 









grm. 



per cent. 



I. 





Original weight 



4 73 









5 -42 



14 7 







After further 17 



days 5 -29 



11 -8 







jj >j 



4 -33 



-8-4 



II. 



Pure food solution + silver fraction 



Original weight 



4-73 







from bacterised peat 



After 16 days , 



5-57 



17 -7 





After further 17 



days 6 -65 



40-6 









7 -33 



54-9 



8-0 



4 '°0 IO 20 30 40 50 

 Time in days 



Up to a certain point the two series of plants increased in weight to an 

 almost equal extent, but beyond this point the seedlings growing in pure 

 food solution appeared to be unable to utilise the food elements supplied 

 to them ; a condition wbich was apparently corrected by the addition of 

 the silver fraction. 



Experimenting with guinea-pigs in 1909, Furst* demonstrated that seeds 

 of barley, oats, peas and flax contained no curative substances for scurvy, 

 but that during the germination of these seeds anti-scorbutic substances 

 developed, which were quite as effective as extracts from green vegetables. 



* Furst, 'Zeitschr. f. Hyg. u. Infekt.,' vol. 72, p. 121. 



