RESULTS OF EXPERIMENTS. 
: 87 
TABLE XX1V.—Results from using root grafts inoculated with pieces of apple crown-gall 
of the soft form. 
| | uni Grafts inocu- | Grafts with 
ny a lated with gall | root entp in- 
“ Age Number | : chip. serted. 
Number of experiment. Wat trecss lnoninocs! 
Galled. | Hairy. | Galled.| Hairy. | Galled. | Hairy 
Per ct. | Per ct. | Per ct. | | | Per ct. | Per ct.| Per ct. 
Tie BISE Boon On oan es Ban eee | 1 year-..-| 1,600 25. 3 4.1 45. 4 3.6 39.5 2.8 
The ee See ote ene eee ee | 2 years..| 1, 445 8.3 9.3 36. 6 6.3 10.6 8.3 
ie es et Sos. .| 3. ¥ears<- 1,378 3. 6 9.4 19. 5 | 7. 6 | 4.6 10. 4 
eee See ee | ee | | 
| 4,423] 108 Tb len S422 5.8 | 18.9 7a 
Quest a 1 year... Geao Ware! PEK iai | 63a 0 | lo: taciae me reT 
Vika AS Sm a ae er a | 2 years... 661 14.7 12.9 35. 7 20. 5 16.5 1G 
25 10. 4 12.1 36.5 | 19.2 HGS 7 16.0 
ae en Eat Sb da ee 1,586 8.0 81] 22.6 88] 10.7 10.7 
TILER es ce i ea raed a eee Telos et ES: lee S85 | OT. A 85} 165 9.0 
TaBLE XXV.—Results of experiments showing the increase in the communicability of dis- 
ease due to defective root grafting. 
| | Trees with grafts well made. | Trees with grafts poorly made. 
Number of experiment. - | ee | , 
< |Number.| Galled. Hairy. | Number.| Galled. | Hairy. 
| pe 
earl 
Per cent. | Per cent. Per cent. | Per cent. 
Thien Sacks Ie a Se eaten ee 1 year.....| 1,078 13.3 2.6 869 55. 0 3.1 
i LP Sess sy toe cles ites ees esc eee coe ee 2 years....| 898 5eal! 5.3 771 15. 3 7.4 
1 a = A ee 3 years 998 oe L 6.5 789 4.3 10.3 
| 2,974 7.6 5.0| 2,429| 25.9 6.8 
oS Sin. eg a ete ga | 1 year..... 268| 11.6 Ane 247| 51.5 1.6 
gee con! ROSE ee ee eee 2 years 447 7.4 9.2 401 | 16.5 16.2 
715 8.8 7.3 | 648 | 29.8 10.7 
2 nS Hee eee 2years....| 1,283 6. 7.9 1, 035 | 19.9 11.9 
Titia is 2a Seared teen | 4,972 7.9 | 5.9] 4,112 | 25.0 8.8 
1 { 
TaBLE XXVI.—Results of experiments with scions taken from trees diseased with crown- 
gall and with scions from healthy trees. 
(Experiment 1.) 
Variety. 
GE a ae 2 Se a 
ve epee SSS BOS a6 See 
PRO DAP cs te ee SEE 
| Number obtained from scions 
from healthy trees. 
| Number obtained from scions 
from diseased trees. 
| Smooth. | Galled. | Hairy. 
122 | 71 52 
29 | 56 21 
112 | 24 8 
107 | 30 33 
207 | 36 | 25 
577 217 139 
| 61.8 23.3 14.9 
186 
Smooth.} Galled. | Hairy. 
| 
105 53 | 107 
| 19 75 10 
99 36 18 
77 16 33 
191 58 | 38 
| | 491 | 938 | 206 
52.5 25.5 | 22.0 
