Christmas Fern 8g 
own observations, it appears that they are likely to be induced by 
anything acting as a strong stimulus to the plant, such as sunlight, 
or an unusual supply of food brought within the plant’s reach by 
heavy rains. Mr. Eaton reports finding them late in the season 
in the second growth of vigorous plants, although fruiting lightly 
in such cases. They are often to be seen in plants exposed to 
the sun from the cutting down of surrounding woods. Mr. 
Eaton states that they are seldom found in plants growing in 
shade, and that they disappear in localities when surrounding 
trees that have been cut down are replaced by others. In short, 
we have here, apparently, the remarkable case of a plant often 
stimulated to a height of leaf-development far beyond the usual 
one, and lapsing to its usual state when the stimulus is with- 
drawn. 
