128 ASPARAGUS AND RHUBARB. 
trenches are sometimes heated by hot-water pipes. In 
some instances, sashes are placed over the plants tem- 
porarily. 
These various practices have suggested the idea that 
asparagus, rhubarb, sea-kale, and the like, might be per- 
manently grown in a house with a removable roof, so 
that heat could be applied to them late in winter, and 
the roof then be removed and the plants find themselves 
growing out of doors in normal conditions. If the ground 
were well enriched, it would seem that such plantations 
gi. Frame-work and heating pipes of Cornell asparagus house. 
ought to be able to be forced for several or many years 
in succession. Acting upon this suggestion, an aspara- 
gus house has been erected at Cornell. The experience 
with this house has not been sufficiently extended to 
warrant any conclusions from the experiment, but it 
promises well, and a description of it may be suggestive 
to the reader who is interested in the forcing of aspara- 
gus or rhubarb. 
