ON THE INFLUENCE OF DIFFERENT RATIOS OF LIME. 365 



stored up in the seeds would decrease with the age of the plants 

 and that therefore the best ratio between lime and magnesia for 

 the later age might differ from that for the young state of the 

 plants. 



Since a fungus made its appearance on the leaves, the 

 experiment was terminated on April iitli. The average length 

 of the branches was : 



a. 17 cm. 



b. 19.6 ,, 



c. 22.2 ,, 



d. 26.1 ,, 



e. 24.I ,, 



The thickness of the branches differed considerably, hence 

 also the weight ; the greatest thickness, as shown in the photo- 

 graph, was observed in (c) ; the next, in (d) ; five of the thickest 

 branches from each case were weighed together with the roots 

 of the whole plants ; the result was : 



a. 1 1 .0 grm. 



b. 26.0 ,, 



c 32.5 



d. 32.O ,, 



e. 28.O ,, 



The branches in (d) and (c), that is with the proportions 

 CaOYMgO, 2 : 1 and 1 : I were the heaviest. 



Since the water lost by evaporation, can, other things 

 being equal, be considered as relative in amount to the total 

 surface of the leaves, a record was kept of the water used in 

 replenishing the evaporated solutions. The quantity of water 

 lost by transpiration from March 6th, up to April 8th, was : 



a. 456 cc. 



b. 1 196 ,, 



c. 1362 ,, 



d. 1564 ,, 



e. 1389 ,, 



The largest surface of leaves was therefore developed in (d), 

 that is, where the proportion of CaO : MgO was as 2 : I. 



