CHAI-. XVI. CAPTURED INSECTS. 309 



pedicels are multicellular, are longer than elsewLere, 

 and bear smaller glands. All the glands secrete a 

 colourless fluid, which is so viscid that I have seen a 

 fine thread drawn out to a length of 18 inches; but 

 the fluid in this case was secreted by a gland which 

 had been excited. The edge of the leaf is translucent, 

 and does not bear any glands ; and here the spiral 

 vessels, proceeding from the midrib, terminate in cells 

 marked by a spiral line, somewhat like those within 

 the glands of Drosera. 



The roots are short. Three plants were dug up in 

 North Wales on June 20, and carefully washed ; 

 each bore five or six unbranched roots, the longest of 

 which was only 1/2 of an inch. Two rather young 

 plants were examined on September 28 ; these had a 

 greater number of roots, namely eight and eighteen, 

 all under 1 inch in length, and very little branched. 



I was led to investigate the habits of this plant by 

 being told by Mr. W. Marshall that on the mountains 

 of Cumberland many insects adhere to the leaves. 



A friend sent me on June 23 thirty-nine leaves from North 

 Welles, which were selected owing to objects of some kind ad- 

 hering to them. Of these leaves, thirty-two had caught 142 

 insects, or on an average 4'4 per leaf, minute fragments of 

 insects not being included. Besides the insects, small leaves 

 belonging to four different kinds of plants, those of Erica tetralix 

 being much the commonest, and three minute seedling plants, 

 blown by the wind, adhered to nineteen of the leaves. One had 

 caught as many as ten leaves of the Erica. Seeds or fruits, 

 commonly of Carex and one of Juncus, besides bits of moss 

 and other rubbish, likewise adhered to six of the thirty -nine 

 leaves. The same friend, on June 27, collected nine plants 

 bearing seventy-four leaves, and all of these, with the except ion 

 of three young leaves, had caught insects ; thirty insects were 

 counted on one leaf, eighteen on a second, and sixteen on a third. 

 Another friend examined on August 22 some plants in Donegal, 

 Ireland, and found insects on 70 out of 157 leaves ; fifteen of 



