10 
The experiments were designed to obtain definite information on five 
principal questions, as follows: 
(1) A comparison of eight fungicides, each containing approximately 
the same amount of the compound of copper as the ammoniacal solu- 
tion of copper carbonate, (a) as regards their effect on the healthy foli- 
age, flowers, and fruit; (b) their efficacy as preventives of black rot; 
and (¢) their relative cost. The formule for the fungicides are given 
below: 
1. AMMONIACAL SOLUTION. 
Copper ‘carbonate 55... toes act se eee ee eee eae eee ounce.. 4 
Agia ammonia (26°): sso222cin2 25s eee ee eee ounces... 6 
INaLOR 8 R02 os seed Ser POR ARn Te eres were ere ere gallons... 44 
The copper carbonate was first mixed with sufficient water to form a 
thick paste. The ammonia was then slowly added until the solution 
became perfectly clear. Sometimes it requires more than 6 ounces of 
ammonia, Sometimes less. 
2. MODIFIED EAU CELESTE, 
Copper sulplates: 25 52oae 2) SIS ee ae ete 5 ee eee ounces.. 24 
SHOUMrCanDONALC: «250.255 FS secs Oo Se ee een es eee do 3 
Itc EA aDO Dees. 2 =o ie Soe ene Bee, oe ces ee oe eee os 52 232 
VidIDOTY'oae Set StL eee co ere ee eee eee gallons... 64 
The copper sulphate and carbonate of soda were each dissolved in 
half a gallon of water, using separate vessels for the purpose. The 
two solutions were then mixed, the ammonia was poured in, and sufficient 
water added to make 63 gallons. 
3. PRECIPITATED COPPER CARBONATE SOLUTION. 
Copper sulphates 2: 2) Srle ese tee ee eee eee ounces... 24 
Sodium Garvonate: 22 fo. sae hee ise ieee ee ere er dor ses ie 
WWieiGONs ois 2h Se clk ea SFE Se ak Bie eee Nene ne Siegert gallons.. 64 
The copper sulphate was dissolved in half a gallon of water, the car- 
bonate of soda was then stirred in and the solution diluted to 64 gallons. 
4. COPPER SACCHARATE. 
Copper sulphate: -2 52.2. Joe oes se ee eee ee ee eee ounces.. 24 
Sodinm ecarbomate, 5.532.322 (teat Sond oa oe eee dope 
Cheap molasses is: o2%.- Fs he ee ee ee eee ee ee doress4 3 
UVM TS eS rs Nc ok ik ON rane a eS ee ee ee gallons... 64 
This was prepared exactly like No. 5, the molasses being added last. 
5. GLUE MIXTURE. 
Copper sulphate s.225 204222 25-2 ee ee 8 eee ounces.. 24 
Sodium carbonite,. 26 «288 Se ess ee ee ee do2eet se 
Cheap olue 2. 222.20 SS eee oe renee see eee ee doses a2 
Water o.oo. fa oo Oe ee eee oe ee oe ee eee gallons.. 64 
Prepared in the same way as No. 4, 
