ACTION OF LEAD ARSENATE ON FOLIAGE. 



29 



jury, some of the leaves showing the "shot hole" effect, but not more than 2 or 3 per 

 cent were so injured. As before noted, the small amount of fruit present was, as a rule, 

 inferior, but this condition appeared to be due mainly to fungus diseases. No fungi- 

 cide had been applied, and the season was favorable to the growth of fungi. 



August 7. No further injury was shown than that recorded in the preceding obser- 

 vations. A few peaches from trees sprayed with lead arsenate from either source 

 had the appearance which arsenic injury frequently gives; that is, a dark, shriveled 

 spot on the end, evidently where a drop of the spray had collected and concentrated. 

 The greatest injury and in fact the only positive injury to foliage was shown in Ex- 

 periments 11 A and 11 13, to which lead nitrate had been applied. 



August J7 . The fruit was just ripening at this date, but the crop was too small to 

 draw any positive conclusions except in a general way. There was more fruit on 

 the trees that had been sprayed with lead arsenate, and it was also in better condi- 

 tion. That on trees sprayed with lead acetate and lead nitrate was in very good 

 condition, but the amount was small. The main difference in the appearance of the 

 fruit that had received the applications of lead arsenate, aside from the few cases 

 noted, was its deep red color, which gave it a better appearance and, in this instance, 

 in no way injured the quality. 



WEATHER CONDITIONS. 



Table VI shows the meteorological conditions for the period from 

 March 1 to September 1, 1907, and Table VII gives a comparison 

 between the temperature and rainfall for this season and the average 

 data for thirty-seven years. 



TABLE VI. Monthly meteorological data, March to August, 1907, Washington, D. C. 



MARCH. 



