860 ON EPIDERMAL CHLOROPHYLL. 
One explanation of the discrepancy between us may perhaps be 
sought in the different time of year at which our respective obser- 
vations were made, Stihr has argued, though certainly from no 
pper 
. 
hyll resides in the injury 
P 
lls é chl 
cells’ protoplasm was in a healthy condition ; that of the other cells 
took the form of a cloud. granular mass. ow, it was from Apri 
portion of my work dealing with this branch of the subject was 
undertaken at the end of September, in a poor light, and after a 
long spell of dull weather, + 
Acetosella alone ; all his other types, he says, gave negative results, 
4: : here: oubt whether the starch which 
he did see in O. Acetosella was the product of epidermal assimilation. 
5 
® 
® 
& 
& 
i 
2 
So 
a 
SR eed to find 'y oe er k!, ‘ aE ie 44 42 
¢ chlorophyll may be formed in epi l cells during the afternoon and 
succeeding early forenoon, and be d a — ee = 
and regenerated a few hours ad 
Ss. 
+ See also Berthold (Pringsheim’s Jahrb. £. Wiss. Bot. xiii.) on absence of 
chromatophores from the epidermal cells of Marine Alge. 
