Section 7. 
TEMPERATURE. 
Tae A.ERNS require more or less heat, according to 
ke yy their natural place of growth. Most of those 
“iiq| from the Tropics require stove temperature. 
If, however, they grow high up the mountains, 
where the temperature is much lower than near the sea 
level, they may be cultivated in a warm or cool green- 
house. Some species are found in both hot and cold 
climates, hence they may be cultivated in various 
temperatures. 
For convenience of cultivation the whole family may 
be divided into classes—those requiring stove tempera- 
ture, those suitable for a warm greenhouse, and those 
which may be successfully cultivated in cool greenhouse; 
those more hardy for cold greenhouse or frame, and the 
perfectly hardy species. 
STOVE TEMPERATURE. 
This need not be so high for Ferns as is often supposed, 
neither must it be as high in winter as in summer. 
Taking December as the starting point, the night 
temperature should be 60° to 65°, rising to 70° during the 
day. About the middle of January the days lengthen, 
and as the light becomes stronger and of greater dura- 
tion, the temperature should gradually rise and continue 
to do so until by the end of May the maximum is reached 
at 70° by night and 75° to 80° by day. This temperature 
should be maintained during -June and July, when it 
