[V 



504 ANNALS 



Explanation of Plate 



Figure ] . 



PLATE 15 



Culture no. Conditions of growth. 



1 (1)*10 days in unrenewed dist. H 2 0, 42 days in unrenewed full nutr. 



2 (2) 10 days in unrenewed dist. II 2 0, 42 days in renewed full nutr. 



3 (3) 10 days in renewed dist. H 2 0, 42 days in unrenewed full nutr. 



4 (4) 10 days in renewed dist. H 2 0, 42 days in renewed full nutr. 



5 (5) 20 days in unrenewed dist. Ii 2 0, 32 days in unrenewed full nutr. 

 tf (G) 20 days in unrenewed dist. H 2 0, 32 days in renewed full nutr. 



7 (7) 20 days in renewed dist. H 2 0, 32 days in unrenewed full nutr. 



8 (8) 20 days in renewed (list. HoO, 32 days in renewed full nutr. 



9 (9) 30 days in unrenewed dist. 11 2 0, 22 days in unrenewed full nutr. 



10 (10) 30 days in unrenewed dist. H 2 0, 22 days in renewed full nutr. 



11 (11) 30 days in renewed dist. H 2 0, 22 days in unrenewed full nutr. 



12 (12) 30 days in renewed dist. H 2 0, 22 days in renewed full nutr. 



13 (13) 40 days in unrenewed dist. H 2 0, 12 days in unrenewed full nutr. 



14 (15) 40 days in renewed dist. H 2 0, 12 days in unrenewed full nutr. 



Figure 2. 



1 (l)f32 days in unrenewed dist. H2O. 



2 (2) 32 days in renewed dist. H 2 0. 



3 (20) 32 days in unrenewed N/20 MgCl 2 & N/1000 CaCl 2 . 



4 (22) 1 day in unrenewed N/20 MgCl 2 & N/1000 CaCl 2 , 31 days unre- 



newed full nutr. 



5 (23) 2 days in unrenewed N/20 MgCl 2 & N/1000 CaCl 2 , 30 days un- 



newed full nutr. 



6 (24) 4 days in unrenewed N/20 MgCl 2 & N/1000 CaCl 2 , 28 days un- 



newed full nutr. 



7 (25) 8 days in unrenewed N/20 MgCl 2 & N/1000 CaCl 2 , 24 days unre- 



newed full nutr. 



8 (26) 12 days in unrenewed N/20 MgCl 2 & N/1000 CaCl 2 , 20 days un- 



newed full nutr. 



9 (27) 16 days in unrenewed N/20 MgCl 2 & N/1000 CaCl 2 , 16 days unre- 



newed full nutr. 



10 (28) 20 days in unrenewed N/20 MgCl 2 & N/1000 CaCl 2 , 12 days unre- 



newed full nutr. 



11 (29) 32 days in unrenewed full nutrient solution. 



*The numbers in parentheses correspond to the culture numbers of series 3. (See 

 table v.) 



fThe numbers in parentheses correspond to the culture numbers of series 4. (See 

 table vi.) 



