Quar. XVI. SECRETION, ABSORPTION, DIGESTION. 385 
which was left being of a dirty colour, including globules of oil. 
They thus differed in appearance from other grains kept in 
water for the same length of time. ‘The glands in contact with 
the pollen-grains had evidently absorbed matter from them; for 
they had lost their natural pale-green tint, and contained aggre- 
gated globular masses of protoplasm. 
(14) Square hits of the leaves of spinach, cabbage, and a 
saxifrage, and the entire leaves of Erica tet alix, all excited the 
glands to increased secretion, ‘he spinach was the most cffec- 
tive, for it caused the secretion evidently to increase in 1 hy. 
40 m., and ultimately to run some way down the leaf; but the 
glands soon began to dry, viz. after 35 hrs. The leaves of rica 
tetralia began to act in 7 hrs. 30 m., but never caused much 
secretion; nor did the bits of leaf of the saxifrage, though in 
this case the glands continued to secrete for seven days. Some 
leaves of Pinguicula were sent me from North Wales, to which 
leaves of rica tetrulix and of an unknown plant adhered; and 
the glands in contact with them had their contents plainly 
aggregated, as if they had been in contact with insects; whilst 
the other glands on the same leaves contained only clear 
homogeneous fluid. 
(15) Seeds——A considerable number of seeds or fruits se- 
lected by hazard, some fresh and some a year old, some soaked 
for a short time in water and some not soaked, were tried. The 
ten following kinds, namely cabbage, radish, Anemone nemo- 
rosa, Rumen acetosa, Carex sylvutica, unustard, turnip, cress, 
Ranunculus acris, and Avena pub:scens, all excited much secre- 
tion, whic) was in several cases tested and found always acid. 
The five first-named seeds excited the glands more than the 
others. The secretion was seldom copious until about 24 his. 
had elapsed, no doubt owing to the coats of the seeds not being 
easily permeable. Nevertheless, cabbage seeds excited some 
secretion in 4 hrs. 30 m.; and this increased so much in 18 hrs. 
as to run down the leaves. The seeds or properly the fruits of 
Carex are much oftener found adhering to leaves in a state of 
nature than those of any other genus; and the fruits of Carex 
sylvatica excited so much secretion that in 15 hrs. it ran into 
the incurved edges; but the glands ceased to secrete after 
40 hrs. On the other hand, the glands on which the seeds 
of the Rumex and Avena rested continued to seerete for nine 
days. 
The nine following kinds of seeds excited only a slight 
amount of secretion, namely celery, parsnip, caraway, Linum 
grandiflorum, Cassia, Trifolium pannowicum, Plantago, onion, 
