158 TRANS. OF THE ACAD. OF SCIENCE. 
this description, and when any of these qualities have been 
wanting the most skillful vine-growers have carefully supplied 
them by artificial means. Hence Virgil directs to place “po- 
rous stones and rough shells” in the trenches—the stones and 
shells to loosen the soil and perfect the drainage, and the 
a oft supply the defect of lime. The vine has ever suc- 
gric . mpositions 0 
vines grown five different soils. The result ed 
‘Gratz. 
Mountain 
‘ Gratz. 
Limestone. 
‘Primary Rocks. 
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