50 The Principles of Fruit-growing. 
“Here the drying effect of the wind at 300 feet 
was 30 per cent greater than at 20 feet, and 7 per 
cent greater than at 150 feet from the hedge. 
“When the air came across a clover field 780 
feet wide, the observed rates of evaporation were: 
SAt: 20: feet frond ClOVEs taj saci seca see veins a soees ee es 9.3 ce. 
CTO) OR EE GOSS se wa ossddseudeatapanacva: sreitinaha'e easton Weare: yey 
#6 200 tt We: os oy Nae W Gee ee eR OR Owes 13; 4 
or 40 per cent greater at 300 feet away than at 
20 feet, and 7.4 per cent greater than at 150 feet. 
“The protective influence of grass lands and the 
disadvantage of very broad fields of these light soils 
was further shown by the increasingly poorer stand 
of young clover as the eastern margin of these 
fields was approached, even on fields where the 
drifting had been inappreciable. Below are given 
the number of clover plants per equal areas on 
three different farms, as the distance to the east- 
ward of grass fields increased: 
“No 1, at 50 feet, 574 plants; at 200 feet, 390 plants; at 400 feet, 
231 plants. 
“No 2, at 100 feet, 249 plants ; at 200 feet, 277 plants; at 400 feet, 
193 plants ; at 600 feet, 189 plants; at 800 feet, 138 plants > at 1,000 
feet, 48 plants. 
“No. 3, at 50 feet, 1,130 plants; at 400 feet, 600 plants; at 700 
feet, 543 plants. 
“In these cases the difference in stand appears 
to have resulted from an increasing drying action 
of the wind. On the majority of fields the de- 
structive effects of the winds were very evident to 
