CHAP. 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 bo 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 seen 

 with Primula sine/isis, 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. 30 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 tetralix. 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 



