GRAFTING 59 
stock must be very gradually performed to avoid extreme 
checks. 
Herbaceous-Grafting. 
As its name indicates, this is applicable for increasing 
plants when still growing, but at the same time becom- 
ing solidified and passing into an herbaceous state. The 
system has been applied with success in grafting the 
Melon on the Cucumber, the Tomato on the Potato, 
dwarf species of Cacti on tall ones, etc. Its chief 
GRAFT OF MAMMILLARIA ON CEREUS STOCK. 
advantage, however, is in the increase of resinous trees, 
principally Pines, by inserting grafts on the points of 
commoner species, which may be used as stocks. 
The proper time for the operation is in May, when 
the young shoots are just beginning to grow, or else 
when growth stops and the shoots are assuming a 
woody nature. Stock and scion should, if possible, 
