393 M. S. B. Sclmctzler on the Aeriferous 



the laciniatcd leaf, whilst the interior cells of the pedicel place 

 themselves in couamunication with the tissue forming the veins, 

 of which they subsequently appear to be a continuation. As 

 the pedicel thus becomes a prolongation of a segment of the 

 leaf, the little globular body v.'hich it supports appears to us to 

 be a portion of the parenchyma of the same leaf. The walls of 

 the little cellular body, of which the extremity first hollows into 

 a cup, become developed, whilst the bottom remains stationary ; 

 these walls finally unite, and thus form a closed cavity. In the 

 utricles thus formed in Utriculuria minor we see towards the so- 

 called mouth pinnatifid prolongations or appendages, similar to 

 the capillary segments of the true leaves, in such a manner that 

 the perfect utricle appears to be an expansion of the parenchyma 

 of the leaf, supported upon a vein which is prolonged and rami- 

 fied beyond the utricle. The extremity, which is at first open, 

 becomes closed at length by two unequal folds of the walls. 

 There is thus formed a sort of funnel, clothed with hairs, at the 

 bottom of which the folds appear as two dark bands bearing 

 linear hairs, whilst those which occur at the entrance are usually 

 capitulate. 



Although tlie utricles, at the commencement of their forma- 

 tion, make their appearance at the angles of the leaf-segments, 

 this position is by no means constant when we examine them in 

 more advanced phases, when the leaf itself is modified. 



The pedicellate globules of Benjamin often occur far enough 

 from the angle of the segments : in Utricularia jninor we even 

 see them sometimes at the extremity of the divisions of the leaf. 

 We therefore cannot infer from their position their analogy to 

 buds. It will be easily understood, from what precedes, that 

 the pedicellate globules of Benjamin and the little horn-like 

 bodies of Schleiden are nothing but intermediate phases between 

 the first commencement of tlie utricle and its definitive form. 



The anatomical examination of the perfect utricle further 

 confirms us in this view. Tiic walls of the utricle consist of two 

 layers of angular cells, at first of a very bright green colour. In 

 the intercellular canals we see at the earliest periods some small 

 conical cells, which terminate within and v^ithout in a small 

 rounded cell ; the interior cell afterwards forms the base of the 

 quadrifid hairs, the formation of which we have already described 

 according to Schacht. 



This author does not mention the exterior cells, which are 

 always seen in great n ambers, even on the young utricles of 

 Utricularia minor, in the form of little flattened globules, often 

 subsequently divided into two ; these globules likewise occur on 

 the otlier parts of the segmented leaf, where they appear in the 

 form of little mushrooms, of which the stipes buries itself 



