1915] 



MERRILL DISTILLED WATER 



477 



renewal, especially in the case of plants approaching the 

 maximum time limit of durability in distilled water — a period 

 which enables the results of the two conditions to be more 

 readily seen and compared. 



TABLE V (Series 3) 



GROWTH OF PEAS IN RENEWED AND UNRENEWED MEDIA FOR VARIOUS PERIODS 



UP TO THE MAXIMUM TIME FOR SURVIVAL. ALSO EFFECT OF 



ADDING WATER AT DIFFERENT INTERVALS TO 



MEDIA UNDER VARIOUS CONDITIONS 



Culture 



no. 



1 



2 

 3 

 4 

 5 

 6 



7 



8 



9 



10 



11 



12 



13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 



21 

 22 

 23 

 24 

 25 

 26 

 27 



28 



Length of 



period in 



dist.H 2 

 days 



10 

 10 

 10 

 10 



20 



20 



20 



20 



30 



30 



30 



30 



40 



40 



40 



40 



52 



52 



52 



52 



Dist.H 2 

 renewed or 

 unrenewed 



Length of 



period in 



full nutr. 



days 



Unrenewed 



Unrenewed 



Renewed 



Renewed 



Unrenewed 



Unrenewed 



Renewed 



Renewed 



Unrenewed 



Unrenewed 



Renewed 



Renewed 



Unrenewed 



Unrenewed 



Renewed 



Renewed 



Unrenewed 



Unrenewed 



Renewed 



Renewed 



42 

 42 

 42 

 42 



32 

 32 

 32 

 32 

 22 

 22 

 22 

 22 

 12 

 12 

 12 

 12 



Full nutr. 

 renewed or 



unrenewed 



Unrenewed full nutr. 42 days, dist. H 8 added every 8 days 

 Unrenewed full nutr. 42 days, dist. H 2 added every 4 days 

 Renewed full nutr. 42 days, the sol'n. renewed every 8 days 

 Renewed full nutr. 42 days, the sol'n. renewed every 4 days 

 Unrenewed l/10fullnutr. 42 days, dist. H 2 added every 4 d'ys 

 Unrenewed 1/5 full nutr. 42 days, dist. H 2 added every 8 days 

 Renewed 1/10 full nutr. 42 days, sol'n. renewed every 4 days 

 Renewed 1/5 full nutr. 42 days, sol'n. renewed every 8 days 





Unrenewed 



Renewed 

 Unrenewed 



Renewed 

 Unrenewed 



Renewed 

 Unrenewed 



Renewed 

 Unrenewed 



Renewed 

 Unrenewed 



Renewed 

 Unrenewed 



Renewed 



Unrenewed 



Renewed 



Green 



wt. of 



tops 



gms. 



4.50 



8.00 



4.85 



6.30 



2.70 



5.05 



3.55 



1.40 



.55 



1.30 



1.90 



1.90 



.50 



.55 



.65 



.72 



.60 



.45 



.56 



.55 



6.40 

 6.00 

 8.75 



18.50 

 2.90 

 2.95 



10.10 

 7.85 



In pi. 15 fig. 1 some of the cultures are illustrated, the ones 

 of special interest being Nos. 9-14. The exceptionally small 

 or irregular growth of No. 8 is difficult to account for, because 

 in the renewed full nutrient it should be greater than that of 

 No. 7. Individual resistance is apparent, however. 



