ON EPIDERMAL CHLOROPHYLL. 861 
In this Stohr is quite at variance with De Bary, who speaks of such 
epidermal chlorophyll grains as he was acquainted with “eventually” 
containing starch. I carefully passed 50 species in review wi e 
object of reaching the truth of this matter, and found that in no 
less than 17 of them the a Eroy grains of the lower epidermis 
17 w 
had a more or less plentiful supply of starch. The ere :— 
Stellaria media. Primula vulgaris. 
Tropeolum canariense. Petunia nyctaginiflora. 
Phaseolus vulgaris olanum nigrum 
ult S. Dul 
Bryoni ca. 8. tuberosum. 
Cucurbita ovifera. Verbena chamedrifolia. 
Bellis perennis. Mirabilis longiflora. 
Pyrethrum sinense. Urtica urens. 
Senecio vulgaris. 
In 12 more evidence as to the presence of starch was far less 
sts ; nevertheless slight signs of assimilation were detected 
them 
Viola Tagetes patula. 
Beas oc i ei Leucanthemnum 
Pelargonium zonale. Helianthus a 
Oxalis Acetosella. Digitalis ist 
Circea lutetiana. Spinacia oleracea. 
Bidens tripartita. Mercurialis ann 
The remainder showed no trace of starch, viz. ;— 
Nigella damascena. Pyrethrum Parthenium. 
Reseda odorata. “mire ma pen ac fe 
Dianthus barbatus. Centaurea Cyan 
Tropzolum majus. Helianthus arcane 
Lathyrus odoratus. Da . 
Ribes nigrum. Lactuea sativa. 
Ber Anagallis arvensis. 
R. Gro Borrago officinalis. 
Godetia rubicunda. Mentha piperita. 
Petroselinum sativum. Rheum undulatum. 
Campanula me 
After a short sojourn in darkness the starch is discharged from 
the grains, and they can be recharged on exposure to light. Thus 
of cut shoots of Bryonia dioica kept 34 days in the dark the epi- 
dermal grains showed their first trace of ikiohs is good light in 
14 hour, and it was well seen in 2} hours. If, however, the Bryonia 
was deprived of light oe 3 a starch did not make its appearance 
8 and 4 h And since a careful ee has 
etw 
shown that Waa cued chlorophyll grains may exist in the 
epidermis of very young leaves, while on the other hand no starch 
can be discovered even in the oldest leaves of species in the 
less list, the ‘eventuality’ of the —— of testified to 
by De Bary, i is not borne out by facts 
