BY A. G. HAMILTON. 45 



into the pitcher walls. The small glands already described occur 

 plentifully here, and invariably stain in all parts. 



Mesophyll of lid. — Beneath the outer surface there is a layer 

 of deeply-staining cells, corresponding to the palisade-tissue of 

 the ordinary leaf, containing chlorophyll, rounded in shape, but 

 with their greater length lying parallel to the surface. They lie 

 closely, and have no intercellular spaces. These deeply-staining 

 cells also surround the vascular bundles. The cells lying under 

 this layer are rounded in form, but longer and larger than the 

 outer cells ; and have large intercellular spaces They take the 

 place of the spongy tissue of the ordinary leaf. The}^ contain 

 little or no chlorophyll and do not stain much. Their walls are 

 thin and sometimes pitted. Under the inner lid epidermis there 

 is a layer of large straight-sided cells with hemispherical bases; 

 these also stain faintly. In the areolae the cells beneath the 

 outer surface are also of this type. All the mesophyll cells con- 

 tain starch. There is a considerable amount of vascular tissue 

 with spiral thickenings all through the mesophyll. Blind endings 

 occur here and there under the deeply-staining layer beneath the 

 outer surface; they are thin-walled and have very loose spiral 

 thickenings. 



Body of pitcher: epidermis of outer surface. — The cells are 

 irregular in shape, and sometimes slightly crenate. The surface 

 presents many small elevations which have a stomate at the top 

 (fig. 15). 



Corrugated rim. — The epidermis consists of six-sided cells, at 

 least twice as long as broad, the length running along the tooth. 

 Scattered about among them are many of the small glands already 

 described. Beneath the overhanging curved point of the tooth 

 the cells become shorter and gradually change into the imbricated 

 form occurring on the under side of the lid, and their free points 

 lengthen as they near the inner base of the teeth where these 

 join the ledge, till just at the junction they are decided short 

 hairs pointing outward and downward, and they continue down 

 the ledge. At the base of the teeth the hairs reach a length of 

 0-0381 mm. 



