44 ELECTRICITY IN AGRICULTURE 
and were, in consequence, in a better condition than “the 
experimental fields. 
Remarks.—The increased percentage of produce on the 
experimental plots compared with the control plots has 
here, as always, been determined in the following way :— 
When the produce on the experimental plots is called a, 
and on the control plots 4, the formula will be as 
for the increase per cent. When the sign — is put before 
the figures in the tables, it signifies that the produce on 
the experimental plot has been less than on the control 
(a—b) 100 
3 = decrease 
plot, the formula being, in this case, 
per cent. 
GERMANY. 
EXPERIMENTS AT KRYSCHANOWITZ, NEAR BRESLAU, 
GERMANY, by Dr. Otto Pringsheim. Summer, 1902. 
Dr. Pringsheim, who employed a machine of the same 
size and type as that previously mentioned, obtained the 
following results from the electrical treatment :— 
Area of Exp. Field 
Increase per Cent. Control Field. 
Strawberries ......... SOU = = §  iecraiva 13'4 mM. 
: No.of plants respec- 
H z5: 
Carrots in Garden*. 13°1 | tively 775 and 667 
Potatoes (1st) ...... 13°8 208 8°84 m. 
(2nd) ...... Ly fo le oF NO 1444 m. 
‘ (3rd) ...... 30°3 (average) """"” 144°4 m. 
Barley (zst) ......... 69} TOG esesee 288-0 m. 
vx  CBNG) os stores 14°2 | (average)...... _ 288'0 m. 
Oats (1st) ........000 40°7)  22°6 wee 144°0 m. 
go) (ANG) sisrcn cnet 4°85) (average)... 14470 m. 
The machine was driven by an electric motor fed by 
accumulators, and worked on an area of 1,175 square metres. 
The weather was about the same as at Durham College 
of Science, Newcastle, England, but perhaps a little warmer. 
* The experimental field was more in shade than the control field. The 
part of the experimental field which was in shade gave shorter roots. 
