CAN STRONTIUM AND BARIUM REPLACE CALCIUM. 77 



My results exactly agree with those of Loew,* and as he 

 has already discussed fully the physiological function of lime 

 salts, I will not repeat it here. 



SUMMARY. 



1. Strontium and barium can never replace calcium in 

 phaenogams ; they are strongly poisonous and the poisonous 

 action may, to a certain degree, be lessened by the addition of 

 lime salts. 



2. Haselhoff' s view that strontium can replace calcium is 

 incorrect. 



3. Locw's view that calcium is contained in the nucleus 

 and chlorophyll-bodies in organized compounds would agree 

 best with my observations. 



OBSERVATIONS DURING THE EXPERIMENTS. 



1) BUCKWHEAT. 



Date. 



Weather. 



Temp, 

 (max.) 



Ca 

 plants. 



Ca + Sr 

 plants. 



Sr 

 plants 



Ba 

 plants. 



Remarks. 



April 



Rain 



i6°C 



40 ex. of the solution a< 



lded. 



3-8 cm high. 



10 



Cloudy 



21 





» »» 



)> H 





No difference yet observed 

 6-14 cm. 



1 1 



Pine 



3i 





»f » 







No difference yet observed 

 6-15 cm. 



«3 





25 







J» » 





Ca plants became a little 

 better. 



'5 



»> 



32 







fl 9 







16 





20 



40 c.c. 



of the solution 5) added. 



( '.1 plants were very well, 

 small new leaves appeared, 

 but none on other plants. 



18 



Cloudy 



20 



40 c.c. of the solution added. 





20 



2 3 

 24 



Fine 

 » 



3° 

 20 



25 



Distilled water added. 

 ») » >» 

 »> ii i» 



New leaves also appeared 

 in Ca + Sr plants, Sr and 

 Ba plants suffered much, 

 many leaves falling down 

 from Sr and Ba plants. 

 Experiment stopped. 



* Cf : Die chemische Energie der lebenden Zellen, Chapt. 3 und 4. 



