34 — 



The above trials show that peach foliage is very susceptible to 

 arsenical poisons, and that London purple is much more injurious 

 than Paris green. The young leaves are much 

 less liable to injury than the full grown leaves. 

 This, we are satisfied, is due entirely to the 

 waxy covering which is so abundant upon re- 

 cent leaves and shoots. Late in the season, 

 when the young and waxy growth is slight, 

 nearly all the leaves will be killed by a mixt- 

 ure which would have had scarcely any effect 

 when the tree is just pushing into growth in 



Fig. 3. — Peach Leaf 

 Injured by London 

 Purple. 



spring. Injury early in the 

 season is less apparent, also, 

 for the reason that growth of 

 new leaves is so rapid that de- 

 foliation is obscured. In fact, 

 the casual observer would not 

 have noticed that the trees 

 which shed their leaves in our 

 earlier experiments had sus- 

 tained the slightest injury ; new leaves formed faster than injured 

 leaves fell. This is admirably shown in figures 1 and 2. Fig. 1 



Fig. 4. — Peach Shoot Injured by Lon- 

 don Purple. 



