Cuar. XV. THEIR POWER OF ABSORPTION. 351 
are clothed with numerous multicellular hairs; some simply 
pointed; others bearing glandular heads, and differing much in 
length. The glands on a piece of leaf were examined and found 
to contain only limpid fluid; most of the water was removed 
from beneath the covering glass, and a minute drop of one part 
of carbonate of ammonia to 146 of water was added; so that an 
extremely small dose was given. After an interval of only 3 m. 
there were signs of aggregation within the glands of the shorter 
hairs; and after 5 m. many small globules of a pale brown tint 
appeared in all of them; similar globules, but larger, being 
found in the large glands of the longer hairs. After the speci- 
men had been left for 1 hr. in the solution, many of the smaller 
globules had changed their positions; and two or three vacuoles 
or small spheres (for I know not which they were) of a rather 
darker tint appeared within some of the larger globules. 
Little globules could now be seen in some of the uppermost 
cells of the pedicels, and the protoplasmic lining was slightly 
separated from the walls of the lower cells. After 2 hrs. 30 m. 
from the time of first immersion, the large globules within 
the glands of the longer hairs were converted into masses of 
darker brown granular matter. Hence from what we have scen 
with Primula sinensis, there can be little doubt that these 
masses originally consisted of living protoplasm. 
A drop of a weak infusion of raw meat was placed on a leaf, 
and after 2 hrs. 830 m. many spheres could be seen within the 
glands. These spheres, when looked at again after 30 m., had 
slightly changed their positions and forms, and one had sepa- 
rated into two; but the changes were not quite like those which 
the protoplasm of Drosera undergoes. These hairs, moreover, 
had not been examined before immersion, and there were similar 
spheres in some glands which had not been touched by the 
infusion. 
Erica tetraliz.—A few long glandular hairs project from the 
margins of the upper surfaces of the leaves. The pedicels are 
formed of several rows of cells, and support rather large globular 
heads, secreting viscid matter, by which minute insects are 
occasionally, though rarely, caught. Some leaves were left for 
23 hrs. in a weak infusion of raw meat and in water, and 
the hairs were then compared, but they differed very little or 
not at all. In both cases the contents of the cells seemed rather 
more granular than they were before; but the granules did not 
exhibit any movement. Other leaves were left for 23 hrs. in a 
solution of one part of carbonate of ammonia to 218 of water, 
and here again the granular matter appeared to have increased 
