137 



little older, of N. Allardi. By growth in the sub-epidermal layers 

 a swelling, at b, has risen. This is the first beginning of the inner 

 part of the rim. The surface a — h, later on developed as the 

 corrugated surface, is here a little concave. 



As in Fig. 1, the outer surface is covered with long, branched 

 hairs. Here and there are also seen peltate hairs, which are like- 

 wise in majority on the face a — c, and on the adjacent part of 

 the lid. On the swelling of this, which is here greatly developed, 

 they are of a considerable size. Stomata on the inner side of the 

 lid are not seen here. Spiral- 

 cells, not yet fully developed, 

 exist as in Fig. 1. It was re- 

 markable, that all the sections, 

 treated with Potassium hy- 

 drate at once showed a deep 

 brown hue, especially in the 

 hairs; even with a weak solution 

 of the said liquor the phenome- 

 non appeared. The supposition 

 that the contents might be Tan- 

 nin, was to be confirmed by 

 treatment of the objects with 1. 

 Sulphate of Iron, 2. Bi- 

 chromate of Potassium, 3. 

 Ghlorzink of [odine, 4. The 

 Reagent of Gardiner-Rose. 



In young stages the Tannin 

 occurs both in the hairs, and in the 

 outer and inner undifferentiated 



epidermis of the pitcher. As to what biological part the Tannin- 

 plays in these organs of Nepenthes, it has hitherto been quite im- 

 possible to say the decisive word. 



Fig. 3, a section through the rim of N. Mastersiana, shows 

 plainly the two parts of the collar, a the outer, h the inner; the 

 level a — h is more concave. The outer surface of the pitcher 

 and its lid is furnished with comparatively few of the long, branched 

 hairs; peltate hairs, on the other hand, appear abundantly. It 

 seems, also with regard to other species, that the peltate hairs 

 develop, when the long, branched ones begin to fall, peltate hairs 

 being seen in various young stages of development. The face 



Fig. 3. 



N. Mastersiana. s = sheath, 

 filled with Amylum. 



