249 



I'RriTM. 

 AIM'I.E. I'E.VR. CHEKRY. PLUM. 



K2O 35.68 54.69 51.85 59.21 



NaaO 26.09 8.52 2.19 .54 



CaO 4.08 7.98 7.47 10.04 



MgO 8.75 5.22 5.46 5.4(1 



FeaOa 1.40 1.04 1.98 3.20 



P.O, 13.69 15.20 15.97 15.10 



SOa 6.09 5.69 5.09 3.83 



SiO, 4.32 1.49 9.04 2.36 



CI 1.35 



Pure ash ..... 1.44 1.97 2.20 1.87 



These results give the amount of mineral constituents an average growth 

 of fruit takes from the soil. The following statements, together with the 

 previous calculations, serve as a basis in the determination of the results 

 given in the table which follows : 



APPLES. 



Every alternate year a full grown tree produces 30 bushels weighing 48 

 pounds per bushel. There are on an average 20 trees on an acre. 



C'HERRIE.S. 



The average yield of a cherry tree is 5 bushels, and the weight of a 

 bushel 40 pounds. There are 135 trees on an acre. 



PLUMS. 



The average yield of a plum tree is 6 bushels, and the weight of a bushel 

 is 55 pounds. There are 135 trees on an acre. 



PEARS. 



The average yield of a dwarf tree is 3 bushels, and the weight of a bushel 

 is 48 pounds. There are 363 trees on an acre. 



K„0 NHiO CaO MgO FCoOa P^O., SO 



CI 



Apples. 

 Single tree 

 Acre . 



Cherries. 

 Single tree 

 Acre . . . 



Plums. 

 Single tree 

 Acre . . . 



Pears. 

 Single tree 

 Acre . . 



3.55 

 480. 



m 



4.37 



.08 

 11.7G 



.70 



sn.86 



1.26 

 2.5.2.5 



30.23 



.23 

 31. 



58.5 



18.29 

 39 



.14 



19.14 



.04 

 15.34 



.05 

 8.01 



We next consider the per cent, of nitrogen found present in trees, and 

 also its variation in the different parts of the same tree. The following 



