FRUIT-TREES. 41 



a wall of a brick in breadth may be made 

 from the bottom to the top of fuch ar- 

 ches. 



Tho' where the lands adjoining are not 

 planted with trees, thefe arches will be of 

 great advantage to the trees in tht -arden, 

 for they will extend their roots through 

 them, and have double the quantity of 

 foil to colleft proper juices from. 



I have feen fome walls ftuck with tiles 

 projefting, called horizontal fhelters ; fome 

 built with large pillars, and others with 

 curves : all thefe are attended with evils of 

 one kind or other; for the horizontal 

 flickers are great receptacles of noxious 

 infefts, particularly of the fmall green 

 and variegated caterpillars, &c. which leave 

 their eggs there to be hatched by the heat 

 of the fun the enfuing fpring, and then 

 become very deftru6live to fruit, by eating 

 both the leaves and bloffoms of the apple, 

 pear, &c. and even the buds before they 

 are unfolded. Thefe infefts alfo devour 

 the leaves of the apricot, cherry, and plum, 

 and eat deeply into their fruits when grown 

 to a good fize -, fo that they perifh and 

 drop off the trees. Thefe fhelters are like- 

 wife 



