362 K. A So. 



On January 8th., the result was as follows 





Barley. 



Wheat. 



Solution. 



Length of 

 longest leaf. 



Length of 

 longest root. 



Length of 

 longest leaf. 



Length of 

 longest root. 



Calcium | 



1 0.0 cm. 



6.0 cm. 



12.5 cm. 



4.0 cm. 



nitrate I 



10.5 „ 



5-0 „ 



12.2 „ 



4-6 „ 



Magnesium > 



7.8 cm. 



3.0 cm. 



8.0 cm. 



3.0 cm. 



nitrate J 



7-9 » 



3-o „ 



7-6 ,. 



3-0 



Control 



8.8 cm. 

 1 0.0 „ 



7 cm. 



6.6 „ 



12.5 cm. 

 12.5 „ 



5.8 cm. 

 14.2 „ 



It follows from these measurements that the development in 

 calcium nitrate did not differ much from that in distilled water. 

 Evidently, the magnesia content stored up in the seeds sufficed 

 to counteract the retarding influence of the lime salt of the 

 solution, while in the case of the magnesia plants the poisonous 

 effect of the magnesium salt of the solution became very evident, 

 and would doubtless have been much earlier felt, if the lime of 

 the reserve stores had not partially counteracted it ; the leaflets 

 in this case did not increase in number and became yellowish, 

 while the plants in distilled water and in calcium nitrate, showed 

 new leaflets, and in the case of calcium nitrate also a deep green 

 color in all tlie leaves ; some yellowing had however also taken 

 place with the control plants in distilled water. 



An examination of the roots in magnesium nitrate (Jan. 8.) 

 showed that the cells were dead. Not only were all the cells 

 soon deeply colored in a highly diluted aqueous rosanilin solu- 

 tion, but they also failed to show plasmolysis in a solution of 

 \o% potassium nitrate. Another very noticeable phenomenon 

 was the very profuse production of large roothairs in the calcium 

 nitrate solution; these could not be found cither in the case of 

 the magnesium plants or of those in distilled water. 



