PLATE OCXLII. 



a and b are the ovoid form of the Bcel frnit (JP^glt Marmelos). Although heavy and solid, it floais 

 in water. The rind is pale green, and when ripe of a yellowish brown studded with 

 large and small oil-cells, b is the section, showing the isolated pulp-carpels, c shows 

 a longitudinal section of ona of the latter. Its interior surface is studded with open- 

 mouthed cells, which pour their gummy secretion into the interior of the carpal, and 

 fill it, bathing the seed. The Bcel gum is a sticky astringent substance, soluble in 

 water. The gum-cells are more numerous towards the circumferential side of the carpel, 

 which is also the case with citrus juice-vesicles. I look upon these gum-sacs as 

 the homologues of the citrus juke-vesicles. Their rim projects beyond the inner 

 surface of the carpels, and a little more might make them closed sacks. All the rest 

 of the fruit b' b' is occupied by a yellow spongy substance, and which appears to be 

 the homologue of the white pith which is on the inside of the organge and lemon. 



d and e is a pyriform Brrl. I cat three B<d fruits, from different trees, and in each found 

 eleven pulp, or gum-carpels. This specimen had a very small mamilla, shown at e.' 

 The large and small oil -cells of the rind were distinct. 



J is the irifoliolate leaf of the Bcel. The minute unexpanded leaves are covered on both sides 

 and edges with a short brownish down. This is shed by degrees, as the leaf grows. 

 The oil-cells, of three sizes, are very distinct on the edges. Not so distinct on the 

 othe parts of the blades. The spines are in pairs. 



