
New York Acricurrurat Experiment Srarion. 567 
The experiments were planned so as to compare the effects of 
different fungicides applied in two ways. Series A includes all 
experiments in which the seed was soaked for one and a half 
hours in the fungicide before planting. Series B includes all 
experiments in which the freshly opened furrow or hill was 
sprayed with the fungicide, then the seed was dropped, the 
furrow or hill sprayed again and the seed covered. The fungi- 
cides were prepared as follows: 
a. Copper sulphate (blue vitriol or blue stone) one ounce dis- 
solved in one gallon of water. 
4. Iron sulphate (copperas) one ounce dissolved in one gallon 
of water. 
e. Zine sulphate (white vitriol) one ounce to one gallon of water. 
@ Eau Celeste.— Dissolve one pound of copper sulphate in 
water and just before using add one and a half pints of ammonia — 
and dilute to twenty-two gallons. 
e. Bordeaux mixture.— Dissolve six pounds of copper sulphate, 
add a whitewash made from four pounds of fresh-slaked lime and 
dilute to twenty-two gallons. 
Jj. Mercuric chloride (corrosive sublimate).— Dissolve two ounces 
in two gallons of hot water and let it stand several hours or over 
night, then dilute to fifteen gallons. 
vy. Ammoniacal solution of copper carbonate.— Wet five ounces 
of the carbonate with a little water, then dissolve in three pints 
of ammonia 26 degrees and dilute to fifty gallons. 
In the following tables the per cent of scab * under each treat- 
ment is compared with the per cent of the scab in adjacent 
untreated rows.$ 


* The amount of scab found on the crop when it was harvested can not be correctly estimated 
by dividing the potatoes into two classes, ‘‘scabby”’ and ‘‘not scabby,”’ because all grades of 
differences existed between the ‘“‘not scabby”’ class of the different experiments, some being 
very much more scabby than others. After the potatoes were dug, therefore, they were washed 
and divided into four classes, (1) free from scab, (2) slightly scabby, (3) badly scabby but mer- 
chantable, and (4) unmerchantable. Then counting the amount of scab on the unmerchantable 
class as 100 per cent, the average amount of scab on class 2 was estimated as fifteen per cent 
- as compared with class 4, and the average amount of scab on class 3 was estimated at thirty per 
cent as compared with class4. From these estimates the total per cent. of scab in each 
experiment is easily comp;ted and the results efford a basis of fair comparison ce the amount 
of scab present under each treatment. 
§ In series A there were planted twice as many rows at Peruville as at the Station and this was 
taken into account in computing the general average of all experiments, enue with part of f. 
- and g. whicb lacked the necessary rows for comparison. 
