1881. ] the Peach Tree affected with the “ Yellows,” 969 
| trees, it is easy to see that it must be a serious matter to the tree. 
| The leaves are its lungs and its stomach. Respiration and 
digestion are carried on through them. If, then, the active vivify- 
ing power of the chlorophyl is-impaired, as it must be in such a 
disorganized condition, the sap must cease to be properly elabo- 
B33 OR 
_ Fic. 4.—Same as Fig. 3. 
_ tated, and the tree must suffer. It is very much as if a man were ~ 
afflicted at one time with both hi Shi ani stain No 
_ Wonder that the tree at length dies.” 
To observe the action, method af growth, position ine: the | 
_ Character of this intruder, has been the object of my work since 
VOL, XV.—No, XII, ; 67 
