1907] 



OSTERHOUT BALANCED SOLUTIONS 



261 



a diatom (Navicula), and a species of Oedogonium. The results 

 agree closely with those given below. There can be little doubt, 

 therefore, that the algae in general, both fresh-water and marine, 

 obey the same law. 



TABLE III. ALGAE 



A plus sign indicates that the plants were alive when the experiment was stopped. 

 All quantities given are cubic centimeters of 3^/32 solutions. 



CULTURE SOLUTION 



Dilute sea water (total salts 0.6 per cent.) 40 + 



Dilute artificial sea water: 

 1000 NaCl 

 78 MgCl 2 



38 MgS0 4 40 + 



22 KC1 

 10 CaCl 2 



Distilled water 40 + 



Tap water 40 + 



Nad 

 1000 NaCl 



10 CaCl 2 J 



1000 NaCl ) 



22 KC1 [ 40 + 



10 CaCl 2 ) 



1000 NaCl ) 



78 MgCl 2 [ 40 + 



10 CaCl 2 ) 



1000 NaCl 

 78 MgCl 2 

 22-KC1 



1000 NaCl 



22 KC1 



1000 NaCl 



78 MgCla 



'"^Sfecu'-o 



1000 Dist. H 2 O ,/._.. Tj-pi 



22 KC1 =w/495 KU. 



DURATION or LIFE IN DAYS 



Vaucheria 



Spirogyra 



95 + 



95 + 

 95 + 



95 



60 

 65 

 65 



95 + 



LIVERWORTS 



The gemmae of Lunularia furnish ideal material for studies on 

 the effects of solutions. They can be obtained at any time of year, 

 they grow readily when floating on the surfaces of solutions, and 

 are fairly uniform in behavior. The material used in these experi- 



