140 



EXPEBIMENTS WITH PLANTS 



water (i. e., water highly charged with carbonic acid; 

 it is bottled under pressure and sold as "plain soda"), 

 we shall get a milky precipitate or sediment of car- 

 bonate of lime (due to the union of lime and carbonic 



96. The result of a (five weeks) water culture of Wandering Jew: the one marked "full 

 quota" had all the indispensable food- substances dissolved in the water; each of 

 the others lacked one element. 



acid). On adding more soda-water, the milky ap- 

 pearance vanishes and the water becomes clear, owing 

 to the fact that the carbonate of lime has been dis- 

 solved by the excess of carbonic acid. If we now 

 heat this clear water, the excess of carbonic acid will 

 be driven off (as shown by the constant and rapid 



