58 ELECTRICITY IN AGRICULTURE 
We will now make a comparison between some of the 
plants which on the different places have been under treat- 
ment during 1903. 
incease oeetent Increase per cent. of 
a. . * 7 
Place. sugar in sugar beets 
Barley. |Sugarbeets.] Potatoes. | Absolute. | Relative. 
, Per cent. | Per cent. | Per cent. | Per cent. | Per cent. 
Kryschanowitz | 32°5 19°7 76 I°0 72 
Durham Col- 
o lege, England et 49°6 65°5 o'7 8°4 
Atvidaberg ...] 40°1 6'2 4'8 1'9 13°4 
As the machine has worked in these places on very 
different areas we could understand if the increase per cent. 
had a relation to the area; but this is not the case, for in 
Kryschanowitz, near Breslau, where the machine worked 
on an area of 517m?, there was an increase per cent. of barley 
of 32°5 per ae whilst in Atvidaberg, where the machine 
worked on an area of 40,300m? (4'03 hectares), the same 
crop gave 40°I per cent. or 7°6 per cent. more. We must 
therefore conclude that the wet weather which prevailed in 
Atvidaberg during August and September caused this small 
increase of the roots, and also that a greater fertility pre- 
vailed there on the control fields for the same plants. This 
remarkable fact is also observable in the harvest of 
potatoes. In Kryschanowitz there was 7°6 per cent., and in 
Atvidaberg 4°8 per cent. ; but at Durham College, where the 
machine worked on an area of only 100 m?, the increase was 
65°5 percent. The machine at Kryschanowitz had a speed 
of 3°5 turns per second, at Atvidaberg 2°5 turns, and at 
Durham College about 1’o turns ; the quantity of electricity 
generated, and therefore distributed, is almost proportional 
to the number of turns per second. 
The main cause contributing to this unequal result is, 
without doubt, to be found in the inequality of the soil 
of the experimental and control fields, and therefore it is 
