50 
fold. No disease of any kind had made its appearance, indicating 
that the work had commenced in advance of fungous attacks. 
Second treatment (May 19,).—A good rain fell on the 16th of May, and 
in consequence the ground was in excellent condition. The leaves 
on the various blocks made very little growth from May 5 to the 19th, 
the average size on the latter date being as follows: S 
Inches. 
Japan: pear seedlimes:. S2u se. Ne acces eee meee eee .77 by 1. 40 
Prenceh pear ‘see@lings. 225 Socen selene ei eter reer eae .50 by 1. 20 
Mahaleb ehermnes.. <2... se xc s/t Ste Eocene tee lem 6 Sout ener eho Dea 
Quince stocks:72: 2:5 2 eee ee eee eae eee 1.00 by 1.50 
Apple seedlings 2554.5 2<s% se, areolar ee Ee . 83 by 1.25 
Mariana, plum shocks... 222.52 ieece fee see pene ne i er ete ee Oat mtt 
Up to this time no disease whatever had appeared on either the 
treated or untreated blocks. 
Third treatment ; June 1).—The leaves on all of the blocks were about 
full grown when this treatment was made. No leaf-blight or other 
fungous disease had as yet made its appearance. In order to obtain 
some information as to the effect of the treatment on growth, ten stocks 
from each block were selected at random and measured. In the follow- 
ing table the results of these measurements are set forth: 
TABLE 20.—Showing the average height of the original stocks, length of new growth, and- 
size of leaves in each block on June 1. 





Average | Average caer 
Treatment. Stocks. Bee o per ea size of 
stock. | growth. leaves. 
| Inches. | Inches. Inches. 
Uimtreabed... 2. ¢hona-8.-sta8 Japan pear seedlings ...-....-- Wasa | 2.50 1.00 by 1. 68 
Ws Sea Saar. on Jee | French pear seedlings .......-.. >) Boe 1. 45 .79 by 1.13 
ID Waa AasAauaaenenoeagape Mahaleb cherry stocks -.--...-... 8.18 2.73 . 70 by 1.03 
IDL s4s5sGodsscsenesosec Quince stocks .-..........-.... 8. 31 1. 60 . 83 by 1. 08 
DOE ac ete on- eae ioeeone Apple'seedlings).s555-- 2-55-25. 6.01 3h.8t .81 by 1. 96 
IDG Se ech aae2 Hae eS OBEat Mariana plum stocks.-.....--. 13. 74 3.13 -65 by .90 
Bordeaux mixture .-........- Japan pear seedlings .-...-.-..- 5. 40 2.55 .95 by 1.75 
WO scan deasssssnsnt see French pear seedlings .-..--.--. 5. 09 1. 60 . 80 by 1.13 
WO sdscsteees Sesbaac Mahaleb cherry stocks .....--- 8.18 2. 95 . 69 by 1.10 
WY) soeen as sokooe esac aee Quince stockseep ase ne eeeoe ae 8.31 2. 05 . 93 by 1.30 
IU Sasosancosdoesesucsae Aupple seedling steseacce sees ee 6.01 3.70 1. 05 by 1. 90 
WO: scesee een cece Mariana plum stocks ..-------. 13. 74 3. 61 60 by .91 
Ammoniacal solution..--...- Japan pear seedlings .........- 5. 50 2. 71 95 by 1.55 
DOscea se HS ssa oe jelsteie French pear seedlings -...-..-.. 5. 09 1.41 85 by 1.20 
1D ORS RSAC eae a AMAAB en: Mahaleb cherry stocks ..-..-...- 8.18 2. 66 70 by 1. 06 
DOeS vee eosin sees es Quincestockaias-=. esses eee 8. 31 2. 39 1.05 by 1.35 
WD Owe earoet aes ao eise cee Apple seedlings 2220 3... nee 6. 01 3. 36 1.05 by 1.94 
DOs Seles Seicene teens Mariana plum stocks.-.....-.-.-- 13. 74 2.74 .63 by .96 
Potassium sulphide. -.-.-.-..--. Apple'seedlinis 22. o2oe heer aes 6. 01 2.98 . 89 by 1. 80 
The nature of the experiment made it highly important to get stock 
aS uniform in size as possible. The measurements in the foregoing 
table show that there was practically no difference in this respect. 
Fourth treatment (June 16).—In carefully examining the stocks at 
this date it was found that the Bordeaux mixture had injured the foli- 
age of the cherries and plums. Ammoniacal solution had also scorched 
the leaves on these trees, so that altogether the treated stock was not 
in as good condition as the untreated. Leaf-blight had appeared on 
