Prof. Ch. Morren on the Morphology of the Ascidia, 309 



differs from that of the pitcher. Upon the operculum there 

 is a palmate nervation, on the pitcher a parallel nervation* 

 Let us first examine Nepenthes distillatoria : the pitcher has 

 three principal nerves, two in front and one behind, parallel, 

 but diverging at the extremity of the inferior cirrhus ; between 

 these nerves there are other smaller ones parallel with these 

 and with each other. The operculum ends at the posterior 

 nerve, and bears two nerves which terminate angularly at its 

 base and then radiate like two fingers of the hand. Now this 

 posterior nerve of the pitcher is the elongation of the ascidi- 

 ferous cirrhus which is the elongation of the medial nerve of 

 the inferior foliaceous organ. And moreover, upon Nepenthes 

 cristata, each of the two front nerves bears a ridge which evi- 

 dently represents the two margins of a fohaceous blade co- 

 hering so as to form a pitcher. 



In fact, the pitcher is in my opinion a true blade, and the 

 inferior foliaceous organ is a winged petiole. Let us first re- 

 collect that in the phyllodia a compound leaf may unite its 

 leaflets into one body, and that it is not unusual to meet with 

 these halves, quarters, and fifths of these phyllodia, bodies 

 simple at the lower part, leaves compound superiorly, and 

 there bearing a smaller or larger number of leaflets, even from 

 a single leaflet up to a great number. The phyllodia are per- 

 pendicular to the direction of the common plane of all the leaf- 

 lets in a state of waking, and the plane of the phyllodium is 

 in the same direction as the leaflets which are dormant ; as if 

 the cohesion having taken place in their youth, the leaflets had 

 the situation of sleeping organs (the sense in which I use this 

 word sleeping [endormi) here is known.). But these direc- 

 tions, respectively perpendicular the one to the other, are not 

 indispensable when the leaflets of a compound leaf cohere with 

 one another to form the appearance of a simple leaf. I have 

 before me, at this moment, a Schinus Molle raised from seed, in 

 which the young leaves present their leaflets cohering side by 

 side and occupying the same plane as a simple leaf, that is to 

 say, the direction parallel with the horizon. I have in the 

 Museum of Vegetable Anatomy at Liege, a decidedly com- 

 pound leaf of Epimedium macranthum, where there is a simi- 

 lar cohesion of the leaflets, side to side. I suppose now that 



