Communications. 313 



caused a vigorous growth, a rich, dark green colored foliage, and 

 a successful production of grains. 



An examination of the cellular tissue of the diseased plants had 

 shown an excessive accumulation of starch in the cellular tissue, 

 indicating thereby a retention of that constituent, and but little 

 chlorophyll was noticed. On the strength of these results I 

 began, in 1878, to treat slightly affected trees with a phosphatic 

 fertilizer in the usual proportion, adding at the same time from 

 three to four pounds of chloride of potassium (muriate of potash) 

 for every tree, and the diseased branches were cut back once or 

 twice to the healthy wood. Soon after the new growth of the 

 branches regained its green color. The details of this work were 

 carried out by Professor Maynard, who to-day reports these trees 

 in a vigorous condition. In connection with these analyses of 

 healthy and diseased branches of these trees, I also made the 

 analyses of the mineral constituents of the ripe and healthy 

 (entire) early Crawford Peach, and that of the entire, prematurely 

 ripened, diseased fruit. The following statement contains my 

 results : I, fruit ; Crawford's Early Peach, healthy ; II, fruit ; 

 Crawford's Early Peach, diseased ; III, branch ; Crawford's Early 

 Peach, restored; IV, branch; Crawford's Early Peach, diseased: 



I. ir. 



Ferric oxide 58 per cent. .46 per cent. 



Calcium oxide 2.64 " 4.68 



Magnesium oxide ... 6.29 " 5.49 '" 



Phosphoric acid 16.02 " 18.07 



Potassium oxide 74.46 " 71.30 



100.00 " 100.00 " 



III. IV. 



Ferric oxide 52 per cent. 1.45 per cent. 



Calcium oxide 54.52 " 64.23 



Magnesium oxide 7.58 " 10 28 



Phosphoric acid 11.37 " 8.37 



Potassium oxide 26.01 " 15.67 



100.00 " 100.00 



The above analytical results show a remarkable difference in 

 the composition oi the mineral constituents of the iieaithy and 



