534 



BOTANICAL GAZETTE 



[DECEMBER 



tity in sea water, is less injurious than the introduction of such 

 substances as NH4, Ba, Sr, Cs ; Rb, and Li. 



Some attempts were made to obtain a better solution by combi- 

 nations of MgCl 2 +MgS0 4 +KCl+CaCl 2 in the proportions in 

 which they occur in sea water and also in various proportions 

 other than those mentioned above. So far, however, no combi- 



Table showing duration of life in days 



Culture solution 



cu-r 



>» O 



u 



5 



Tap water 



Distilled water. . . 

 Sea water 



Artificial sea water 

 Stock solution* 



49 



47 



102 4- 



78 cc. MgCU 

 38 cc. MgS0 4 

 22 cc. KC1 



375 M 

 375 M 

 375 M 

 375 M 



10 cc. CaCU 



Stock solution4- iooo cc. 



Stock solution-}- iooo cc. 



Stock so!ution4- iooo cc. 



Stock solution-j- iooo cc. 



Stock solution-)- iooo cc. 



4- iooo cc. 

 NaCl .375 M 



Stock solution 4- 



500 cc 

 500 cc 



CaCl a 



MgCl, 



KC1 



MgS0 4 



K 2 S0 4 



MgCl, 



CaCl 2 



375 

 375 

 375 

 375 

 1875 

 375 

 375 



Stock solution+ { 25 ° cc ' ™ g ff* 



I 750 cc. CaCU 



Stock solution 4- \ 5°° cc - KC1 



I 500 cc. CaCI 2 



Stock solution 4- 



1 



Stock solution 4- 



\ 667 cc. KC1 

 ( 333 cc. CaCU 



910 cc. KC1 

 91 cc. CaCU 



M 

 M 

 M 

 M 

 M 

 M 

 M 



1024- 



56 

 52 



73 



47 

 60 



52 



23 

 27 

 134+ 



134+ 



375 M 

 375 M 



375 M 

 375 M 



375 M 

 375 M 



375 M 

 375 M 



52 



47 



73 



66 





52 



52 

 21 



47 



21 



89 



52 



28 



21 



28 



«2 



O rv 



4 



4 



5o + 



50+ 



16 

 10 



8 

 8 

 6 



10 



10 



10 



10 



6 



H 



Q..S 

 u 







Ph 



» • 



t • 



15+ 



15+ 



3 

 2 



* 



3 



4 



c/3 



w 



3 3 



>>Q 



&21 

 o 3 



4 



4 



17 + 



• • 



18+ 



17+ 18+ 



5 



5 

 2 



2 



2 



6 



2 

 2 



1 

 1 

 1 



2 4* 



3 



3 



The (+) sign denotes that the plants were alive when the experiment was discontinued 

 • It should be noted that the stock solution contains no NaCl. 



3 





12 



8 



90+ 



90+ 



12 



30 

 12 



12 



12 



15 



17 



12 



8 



has been 



in the table. 



Similar results were obtained with Gigartina, Ptilota, Iridaea 



and 



Very much more striking results were obtained 



ments 



made in 



Pieces of 



