62 THE CROWN-GALL AND HAIRY-ROOT OF THE APPLE TREBR. 
Wrapping with waxed thread.—The waxed thread used was machine 
cotton No. 28. This was soaked in hot grafting wax until thor- 
oughly penetrated and was then allowed to drain while hot. (See 
fle VEE hes DS) 
Waxing the union.—Ordinary grafts were made with plain thread, 
wrapped as previously described, and then the union of scion and 
root was coated with melted grafting wax nearly at the point of 
hardening. (See Pl. VIII, fig. 1, B.) 
Unwrapped grafts —The grafts left without wrapping of any kind 
were made with special care, so that when the roots and scions were 
joined they remained quite firmly united. (See Pl. VIII, fig. 1, F.) 
Results of ecperments.—As these root grafts were made they were 
divided into eight equal duplicate sets. One set was planted in April, 
1905, ineach of the cooperative plats 1 to 8. (For description see p. 
78.) All plats showed a fair stand in November, 1905. The trees 
grown from these grafts made with No. 1 seedlings and scions corre- 
sponding in diameter were from the beginning larger and more vigor- 
ous than any other lot of trees planted at the same time in other 
parallel experiments in which No. 2 seedling roots were used. This 
was the case even where scions of the same varieties were used. 
This proves that No. 1 seedlings are the best for root grafting. 
In cooperative plats 1 to 4, one-third of the trees were dug at the 
end of one year, taking every third tree in each row; one-third at the 
end of the second year, taking each alternate tree in the row; and the 
remaining trees at the end of the third year. The results from these 
plats, designated as experiment 1, are given in Table XX XVIII, in 
the appendix. 
Of the trees in cooperative plat 6, one-third were dug at the end 
of one year, taking every third tree in each row, and the remaining 
trees at the end of two years. The results from this plat, designated 
as experiment 2, are given in Table XXXIX. 
Of the trees in cooperative plat 5, one-half, taking each alternate 
tree in the row, were dug at the end of the second year and the remain- 
ing trees at the end of the third year. The results from this experi- 
ment, which is designated as experiment 3, are given in Table XL. 
All of the trees in cooperative plats 7 and 8 were dug at the age of 
2 years. The results from these plats, designated as experiment 4, 
are given in Table XLI. 
In order to show the general results from each kind of wrapping 
on 1-year-old, 2-year-old, and 3-year-old trees, the results from the 
four experiments are combined in Table XLII. 
Finally, the results of the four wrapping experiments in cooperative 
plats 1 to 8 are summarized in Table XLIII for convenience in com- 
parison and in summing up the results, 
186 
