4 , CONTENTS. 



. 

 III. Action of lead arBenitte ori 'foliage Continued. Page. 



Summary of results for the two years' experiment 42 



General discussion of problems involved in the investigation 43 



Lead nitrate vs. lead acetate 43 



Susceptibility of peach foliage to injury 44 



Cause of the decomposition of lead arsenate 45 



Experiments on the action of the carbon dioxid of the air 45 



Experiments on the solvent action of water used in spraying. 46 



Conclusions 48 



List of tables... 50 



ILLUSTRATIONS. 



PLATES. 



Page. 

 PLATE I. Effect of different treatments on the settling of lead arsenate. Fig.l. 24 



After standing two minutes. Fig. 2. After standing fifty minutes. 

 II. Peach leaves showing injury from lead arsenate. Fig. 1. Leaves 

 from trees in Experiment 3. Fig. 2. Leaves from trees in Ex- 

 periment 12 34 



III. Check plot, not sprayed, showing normal, healthy foliage of peach 



trees 36 



IV. Peach tree in Experiment 12 sprayed with lead arsenate and show- 



ing partial defoliation 36 



TEXT FIGURE. 



FIG. 1. Injured peaches from trees sprayed with lead arsenate 37 



