Chap. XV.] SECRETION. 271 



much in lenpth. The glands also differ in size, and are of 

 a bright pink or of a purple colour; their upper surfaces are 

 convex, and the lower flat or even concave, so that they re- 

 semble miniature mushrooms in appearance. They are 

 formed of two (as I believe) layers of delicate angular cells, 

 enclosing eight or ten larger cells with thicker zigzag walls. 

 Within these larger cells there are others marked by spiral 

 lines, and apparently connected with the spiral vessels which 

 run up the green multicellular pedicels. The glands secrete 

 large drops of viscid secretion. Other glands, having the 

 same general appearance, are found on the flower-peduncles 

 and calyx. 



Besides the glands which are borne on longer or shorter 

 pedicels, there are numerous ones, both on the upper and 

 lower surfaces of the leaves, so small as 

 to be scarcely visible to the naked eye. 

 They are colourless and almost sessile, 

 either circular or oval in outline; the 

 latter occurring chiefly on the backs of 

 the leaves (Fig. 14). Internally they have 

 exactly the same structure as the larger 

 glands which are supported on pedicels; 

 and indeed the two sets almost graduate 

 into one another. But the sessile glands 

 differ in one important respect, for they 

 never secrete spontaneously, as far as I 

 have seen, though I have examined them 

 under a high power on a hot day, whilst ,r^ Y^' ' , . 

 the glands on pedicels were secreting tan'icum.) 



copiously. Nevertheless, if little bits of Part of leaf, enlarged 

 damp albumen or fibrin are placed on seven times, show- 

 ^, Mill , . , ing lower surface, 



these sessile glands, they, begin after a 



time to secrete, in the same manner as do the glands of 

 Dionaea when similarly treated. When they were merely 

 rubbed with a bit of raw meat, I believe that they likewise 

 secreted. Both the sessile glands and the taller ones on 

 pedicels have the power of rapidly absorbing nitrogenous 

 matter. 



The secretion from the taller glands differs in a remark- 

 able manner from that of Drosera, in being acid before the 

 glands have been in any way excited;' and judging from the 



