erected during winter, and totally removed after the end of 
the frosts in spring. A thousand pounds so expended would 
produce a far greater result than three thousand applied in 
the common manner ; and the annual cost of keeping such 
houses in order would be nothing as compared with the ex- 
pense of greenhouses and stoves. 
This is one of those perennials with succulent, fingered 
roots which multiply sparingly. It is chiefly to its seeds 
that we must look for the means of propagating it. 
