Part I. 



THE ROCK-GARDEN. 



13 



' crag' at its eastern end may cut off the sun till near noon from the 

 great fissures above alluded to, so much the better. Screen from 

 heat is worth double as 

 much in the morning as 

 it is in the afternoon. 

 An eastern exposiire is 

 dried up at a very early 

 hour of hot summer 

 days ; virhile the dew 

 often lingers on plants 

 having a western expo- 

 sure (or a northern one, 

 screened to the eastward) 

 till near noon, and the 

 great heat is cut off for 

 four or five hours, the 

 ' day ' (as a time of en- 

 durance) being curtailed 

 practically by so much. 

 The fact of an eastern 

 exposure being screened 

 in an afternoon from the | 

 hot rays is of compa- 

 ratively little advantage. 

 The air is roasted all the 

 day, and there is no more reviving dew till late in the evening. 

 So that from ' dew to dew ' a west aspect may have its day 

 of 16 hours practically reduced to lo or 11 hours, while an east 



Fig. 12. — A properly formed large fissure. 



Fig. 13. — Section. 



aspect has the whole day to contend with. Fig. 13 supposes 

 a section cut from north to south through the middle of the 



