f 



1907] 



OSTERHOUT— BALANCED SOLUTIONS 



261 



I 



( 



I 



( 



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 3W/32 solutions. 



Culture Solution 



Dilute sea water (total salts 0.6 per cent.) 



Dilute artificial sea water: ^ 



1000 NaCl 



78 MgCU 



38 MgS04 

 22 KCl 



10 CaCU 



Distilled water 



Tap water 



NaCl... 

 1000 NaCl 

 10 CaCU 



1000 NaCl 

 22 KCl 



10 CaCU 



1000 



78 



10 



1000 



78 

 22 



NaCl 



MgCl. 

 CaCl, 



NaCl 



MgCU 

 KCl 



1000 NaCl 

 22 KCl 



1000 



78 



Nad I 



MgCl. S 

 1000 Dist. HaO 



78 MgCl. 



1000 Dist. H2O 

 22 KCl 



1000 Dist. H2O 

 10 CaCU 



m/l^^ MgCIa. . . . 



OT/495 KCl 



;«/io77 CaCU 



Duration of Life in Days 



Vaucberia 



Spirogyra 



95+ 



95 + 



95+ 

 95 + 



60 



6=; 



65 



li 



3 



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 expcri- 



