228 
experiments formed part of the block described under II. The buds 
were inserted the same day under like conditions. They were taken 
on the Way man farm, from a Kelsey plum which was badly affected in 
all parts. Only 12 trees were budded. On November 13, 1891, it was 
found that the diseased buds had healed on to 4 trees, and were still 
living. On the others they had been thrown out. There were no cases 
of rosette. The trees were reexamined November 1, 1892. All were 
free from rosette. This is the only experiment yet undertaken to deter¬ 
mine whether this disease can be transmitted from plums to plums. 
IV. Peach stocks' inoculated with buds taken from rosetted Kelsey 
plums. —This experiment was made to determine whether the plum ro¬ 
sette could be transmitted to peach trees. Two rows of nursery trees, 
37 in all, consisting of Elberta tops on seedlings of the same age as in 
V, were selected for this experiment. This formed part of the nursery 
described in Experiment 1 (Bull. No. 1). Scions were cut from two badly 
diseased Kelsey plums, which stood on the same farm about J mile 
distant. The inoculations were made June 20, 1891, and two buds 
were inserted into each stock. November 12, 1891, an examination 
showed that some part of one or both buds had united with the stock 
in 22 cases, and was still alive. In 3 trees the union was doubtful, and 
in 12 both buds failed to unite. At this date all were healthy with 
exception, possibly, of 1 tree, which had begun to look suspicious. The 
inoculated buds were very feeble, and in no case did they grow into 
branches. Here, then, an organic connection was established between 
the buds and stocks in two-thirds of all the trees. October 29, 1892, 
these trees were reexamined with the following result: Many of the 
buds which had healed on were still alive. Two trees were dug out 
in summer, and may have shown symptoms of rosette, but this is 
doubtful. One of rhese was the tree marked as suspicious in the fall of 
1891. Two trees developed rosette in the spring, in all parts, and died 
in August. The rest were healthy in spite of the fact that sixteen 
months had passed since the insertion of the diseased buds. Both the 
rosetted trees were inoculated from the same plum$ both the missing 
trees from the other plum. 
The small per cent of cases to unions makes it necessary to repeat 
this experiment before it can be stated positively that the plum disease 
is identical with that of the peach and transmissible to it, as seems 
very probable from its appearance. 
V. lioot inoculations , peach on peach. —This experiment was made to 
determine whether the disease could be transmitted from roots to roots, 
and incidentally to throw some light on the possibility of natural in¬ 
fection through the soil. Sixty young trees were selected for this pur¬ 
pose. They stood in the same nursery and were planted the.same time 
as the five rows inoculated in 1890 and described in Experiment 1 (Bull. 
No. 1, p. 49), but bore El berta tops. The collars of the trees in two rows 
were uncovered and all trees badly infested by borers Avere destroyed. 
