126 FURTHER OBSERVATIONS ON THE 
houfe, or by caft-iron pipes, which are frequently ufed with 
fuccefs for this purpofe. 
I have already mentioned, that in Holland it is cuflomary to 
begin forcing Vines as early as in the month of November. 
The frames made ufeof for this v/inter- forcing are generally 
about twenty-five or thirty feet long, about five feet wide at 
bottom, and gt the top about three feet. The height generally 
about ten feet, (the height of the Vine- wall to which the frame 
is affixed) fo that the glafs-frarnes ftand nearly in a perpendi- 
cular direction. The fire-place is at one end, the flue runs 
along the bottom to the oppofite end, and generally returns to 
a chimney built in the middle of the frame. 
The Vines are brought from the wall, and nailed all along 
the front, clofe to the glafs-frames, and are fecurely covered at 
nights : By this difpofition of the branches, it is eafy to con- 
ceive that there mufl: be difficulty in moving along on the 
infide. 
I have feen grapes in thefe frames in pretty good perfecflion 
in the month of April, and was informed that they are fre- 
quently ripe in the beginning of March. The bunches, how- 
ever, are not very plentiful in thefe early crops. The black 
and white Sweetwater are the kinds preferred for this early 
forcing. 
As 
