278 Professor Henslow's Examination, &fc. 



Fig. 13. Ovule; m, foramen ; n, chalaze. 



Fig. 14. Monstrosity of ditto. 



Fig. 15. Details of the ovule after digestion in nitric acid; o, the smaller vesicles com- 

 posing the bulk of the ovule ; p, a paler colored vesicle occasionally found among 

 the former. 



Plate XVIII. 



Highly magnified sections of the style and ovarium. Wherever the same letters are 

 used in this plate as in the last they designate the same parts. 



Fig. 1. Transverse section of one quarter of the upper part of the ovarium. Fig. 2. 

 Transverse section of the style. Fig. 3. Longitudinal section of the stigma, and 

 part of the style. Fig. 4. Longitudinal section of the base of the style and apex 

 of the ovarium, perpendicular to the plane of the dissepiment. 



c, the two large veins, or bundles of trachea?, which rise through the whole length of 

 the style: c, the numerous smaller veins which terminate in its base: d', frag- 

 ments of the vascular bundles which rise into the placenta and branch off to the 

 ovules : e, stigmatic tissue descending down the centre of the style to the summit 

 of the placenta; e\ the same tissue coating over the surface of the placenta, and 

 passing round the bases of the ovules : m, foramen, and n, chalaze, indicated by 

 darker spots; and in Fig. 1. the position of a raphe is apparent through the ovule, 

 by a darker band extending from the hilum to the chalaze: q, vesicle of the 

 stigma : r, tubular vesicles of the stigmatic tissue. 



Fig. 5. o, Vesicles of the cellular tissue of the style detached by digestion in nitric 

 acid : p, one of them marked by a transverse band, when seen more highly 

 magnified. 



