— 139 — 



-"V /J> , 



c-^^: 



Fig. 6. iV. aftipullaria. Nearly 



adult stage, pg = peptic glands; 



CS = conducting surface. 



bends outward and takes its place near the outer wall of the 

 pitcher. In this part of my investigations the development is studied 

 on species, where the outer and inner 

 part of the collar were of almost 

 equal size. As to iV. gracilis and 

 N. ampullaria the question will be 

 treated in Part II: The epidermal for- 

 mations on tlie corrugated rim. 



To what degree the collar is de- 

 veloped in seedling-leaves, I have not 

 been able to investigate, and likewise 

 my materials have not allowed a 

 close examination of the develop- 

 ment of the marginal glands. Litera- 

 ture contains but very little about 

 this matter, though the glands have 

 been investigated by authors like Gib- 

 bons-Hunt, Faivre, Al. Dickson 

 and M a c f a r 1 a n e. G i b b o n s - H u n t (9) 

 discovered them in 1874; Faivre (8) 



mentioned them in greater length, certainly without knowing anything 

 of Hunt's paper. Alexander Dickson (2) has reached the same 



result as Faivre, but 

 speaks nowhere of 

 the two preceding in- 

 vestigations. Mac far- 

 lane seems likewise 

 not to take notice of 

 Faivre; in 1893 he has 

 a short remark on the 

 development of these 

 glands (13), about the 

 exactness of which one 

 cannot help feeling alittle 

 doubt. The marginal 

 glands are supposed to 

 secrete honey (Hooker 

 (8), Goebel(5), Hein- 

 r i cher (6), M ae f ar 1 a n e ( 13) etc.) ; but in one case only {N. gracilis) 

 I have succeeded in indicating it by Fehling's liquor. 



Fi£ 



7. N. gracilis. Recently incurved collar. 

 CS = conducting surface. 



