SCALD, OR EDGE BURN. l8t 



latter to such an extent that they cannot take up 

 water or food. In case the sun is warm at such 

 times and the light bright the young and tender 

 portions of the leaves, namely, the edges, will not 

 have sufficient moisture to serve for growth. If 

 these conditions continue the moisture stored in 

 the cells is used up and then the latter collapse as 

 a result. The disease may be brought on by 

 allowing the soil to get too cold. It is quite 

 common to see plants next to the outer walls 

 of the house showing this difficulty. This is 

 especially the case where there is no air space be- 

 tween the bed proper and the outer wall. The 

 cold from the outside is sufficient to stop the 

 proper working of the roots, and in consequence 

 the parts of tae plant above ground suffer as 

 described 



In certain types of heavy soils, that is, soils 

 containing too much water, the trouble is likely to 

 occur. It must be understood that the roots of 

 plants require air as well as water. If all or 

 nearly all the air spaces in the soil are filled up 

 with water the roots will suffocate and the plants 

 in consequence suffer. The difficulty resulting 

 from cold soil can easily be overcome for the 

 reason that it is rarely found except around the 

 edges of the house. A board set in so as to inter- 

 vene between the wall and the soil outside is 

 often sufficient to prevent the trouble. It is 

 better, however, to have two boards, with a space 



