POTATOS. 
391 
On the pracuical details of Potato culture alone we have many 
treatises, varying in length and differing in style. They include 
volumes on new or improved methods of growing the crop, such 
as the "Jensen" system of earthing up; the proper time to 
plough and manure the land ; the most suitable soil for Potatos ; 
No. 1. — John Geearde. 
{Rfiproduced by photography from Gerarde's ^'Herbal.") 
Fig. 30. 
the varieties adapted for different soils ; the manures which 
ensure the largest marketable return ; economical modes of 
planting, lifting, and storing ; and other topics which we are 
now compelled by stress of time to pass unmentioned. 
