PEACH AND THE PEAR. 85 



necessary to add nitrogenous matter if the trees fail to 

 make a satisfactory amount of wood. The result of the use 

 of this formula is, that we now have trees that are fifteen 

 years old, that have borne five or six good ciops of fruit, 

 and are, at present, apparently in perfect health, 

 although many of them have shown unmistakable signs 

 of the disease, and recovered from it. The disease known 

 as the Yellows with us, takes two forms ; first, a very 

 active form, which often attacks trees that have been 

 injured by the cold after seasons of late growth, and it 

 requires but a few days to destroy the entire tree, except 

 the roots, which often remain alive for a long time after 

 the top is dead. The other, and most common form, is 

 indicated by a yellowish, sickly look, during the entire 

 growing season, and the premature ripening of the fruit. 

 The fruit is always unusually high colored, sometimes 

 the flesh is blood-red, and its brilliant color reminds one 

 of the hectic flush on the cheek of the consumptive ; 

 there is also often a bitter, unpleasant flavor to the fruit. 

 This disease is always accompanied by minute uni-cellular 

 plant-growths, similar to those found in blighted pear 

 trees, or in fermenting ensilage, in fact, resembling those 

 organisms that always accompany fermenting or decom- 

 posing animal or plant tissue. (This shows why we 

 should not use raw manures. — J. J. Black.) The germs 

 producing it are always found in its most active form, are 

 very similar to those that accompany epidemic and con- 



