PEACH AND THE PEAR. 57 



the wood of a Peach-tree affected with Yellows. It con- 

 tains 



0.93 per cent, more Oxide of Iron, 



9.71 " " " Lime, 



2.70 " " " Magnesia, 



3.00 " " less Phosphoric acid, 



10.34 " " " Potash, 



than the ash of healthy trees. Dr. Goessmann infers 

 from his experiments that the wood and fruits of 

 diseased trees contain less potash and more lime than 

 the healthy wood and fruit. 



But, again, here is another analysis where lo.ooo 

 lbs. of diseased twigs would contain 



5.2 lbs. more Silica, 



than the healthy twigs. The diseased twigs here mani- 

 fest as compared with healthy ones, a poverty of all the 

 ash ingredients, except the two first. The most 

 important deficiencies are lime and potash, magnesia 



