94 



THE LIFE OF THE PLANT 



FIG. 25 



salts; it is important 

 that the amount of 

 salts in the solution 

 should not exceed 

 two parts in one 

 thousand, otherwise 

 the solution will be 

 too concentrated. 

 We fix a seedling of 

 any plant whatever 

 to the lid of the jar 

 in such a way that 

 only its rootlets will 

 be immersed in the 

 water. Then we 

 shall be able to ob- 

 serve the develop- 

 ment of the aerial 

 part of the plant, 

 and also that of the 

 root, which is now 

 entirely exposed to 

 view. 



The photographic 

 plates reproduced a 

 little later on (figs. 

 27, 28, 31) record 

 the results of ex- 

 periments made in 

 1896 at the Nijny 

 exhibition. I 

 attribute a parti- 

 cular significance to 

 them, because it is 

 doubtful whether 

 such experiments in 

 all their stages and 



