SEED AND SEEDLINGS II 
Hardening-off is really gradually inuring young plants 
to more air and a reduced temperature in order to 
render them sturdy and strong and to avoid sudden 
checks to foliage or growth. 
ORCHID SEEDLINGS (TWO YEARS), 
It sometimes happens that ‘‘ damping-off ” is destruc- 
tive to pots of young seedlings, causing them to bend 
over and droop down, and finally to decay. It is 
caused by Pythium de Baryanum. The best preven- 
tive measures against such attacks are to sterilize the 
soil before sowing seeds or spores, to provide good 
