292 AGRICULTURAL TEXT-BOOK. 



647. PEACH (Persica vulgaris,) (a,) native of Persia; said 

 to have been found cultivated abundantly by the Indians by 

 Hendrick Hudson, on his first voyage, but never discovered wild 

 on this continent; supposed to be a cultivated variety of the al 

 mond (amygdalus communis,) ; (I,) in Great Britain requires 

 artificial heat; (c,) varieties exceedingly numerous; (d,) propo- 

 gated by seed budding (grafting, and in New Zealand by cut 

 tings) ; (e,) cultivation simple, pruning chiefly confined to short- 

 niny z; (f,) dried; (g,) fattening for hogs o\ving to the Cy 

 anogen of the kernel? (h 7 ) distilled into brandy; (i,) manure** 

 leached ashes; (j,) injured by the Borer, the Aphis, the 

 Curculio; and diseases the Yellows, Curl, &c. causes and 

 remedies. 



648. Inorganic analysis of the leaves of the Peach tree r 

 (pulled July 22), (A,) and of the leaves of a tree affected by 

 tlSe Yellows, (B,) (Emmons.) 



A B 



Carbonic acid, - 13.300 13.200 



Silicic acid, - 0.600 0.800 



Phosphates-, - 9,600 11.600 



Lime, - - 16.220 14300 



Magnesia, - 5.900 5.300 



Potash, - - 14.280 14.440 



Soda, 21220 22.280 



Chlorine, - - - 5.120 4.740 



Sulphuric acid, 4.420 4.430 



Organic acids, - 7.900 4.300 



These analyses are peculiarly interesting, as showing that the 

 disease called the &quot; yellows&quot; does not arise from a deficiency of 

 inorganic matter. Should further examinations sustain this 

 view of the case we may be enabled to find a remedy for this 

 scourge of the peach tree. We throw ont the suggestion, that, 

 owing to the constant generations of plants on the same soil, a 

 change takes place similar to that observed when animals are 

 bred in-and in ; or in other words a scrofulous constitution Z&amp;gt;e- 



