5 



Map No. 1 (page 7) Field No. 1 is a I'orty-acro plot 

 set lo Salsunia oranges. This plot conlaiiis two natural 

 drains; one from the north and the other from the 

 west, which unite near the center of the field to form 

 a larger drain which slopes in a southern and south- 

 easterly direction. Ahove drain No. 2 the wind from 

 the northwest from which direction most cold waves 

 come, has a free sweep for a long distance. As it en- 

 ters the head of drain No. 2 it forces the cold, damp air 

 out of this drain, draws it from drain No. 1, sweeps 

 down the main drain, carrying the cold, damp air he- 

 fore it to the creek. Not a tree was lost in this forty 

 acres from the freezes, and there are six other draws 

 on the same plantation showing similar results. 



Field No. 2 is a forty-acre plot set to oranges. This 

 plot contains one drain which runs across the north- 

 east corner in a south-easterly direction. There is 

 timher along the north side of this drain which forms 

 a wind-hrcak. The cold, damp air on the south side of 

 this drain No. 3 was not dispersed and the trees are 

 killed to the bank as far up as the still cold air .ex- 

 tended (indicated by dotted area). Only banking sav- 

 ed part of this orchard. Concluding from results in 

 field No. 1, had the timber been cut from the north side 

 of brook No. 3, no trees w^ould have been killed to the 

 bank in field No. 2. 



Field No. 5 is a forty-acre plot set to oranges, ex- 

 cept a small area in the north-west corner which is cut 

 off by a highway. This plot contains two natural 

 drains. No. 4 and No. 5, in the north-eastern portion 

 wdiich slope in a north-western direction, and it also 

 has a general western slope toward the creek on the 

 west. Field No. 4 is a forest which serves as a wind- 

 break for field No. 5. Cold, damp air settling in drains 

 Nos. 4 and 5 and near the creek in the north-west cor- 

 ner killed all the trees in these areas. Also a few^ trees 

 were killed up to the middle of the fortj^ from the west 

 side of the field. But, comparatively few^ were killed, 

 as some free wind came through the opening at the 

 bridge as indicated by wind arrows sweeping down the 

 w^estern side with enough force to partiallj' disperse the 

 cold damp air. 



The dashed line in field No. 5 indicates the top of 

 the hill beyond wdiich no trees were killed. A similar 

 line in field No. 1 indicates an equal elevation below 

 or above which no trees were killed. 



