DR THOMAS It. FRASER ON STROPHANTHUS HISPIDUS. 1027 



Fig. 5a. Transverse section of epiearp and of outer mesocarp cells, from a hard mature follicle, a, epicarp ; 



b, mesocarp. x 150. 

 Fig. 5b. Longitudinal section of mesocarp, composed of latex cells embedded in cells of matrix, from an 



immature follicle. x 150. 

 Fig. 5c. Longitudinal section of endocarp, from a hard mature follicle, consisting of indurated cells, which, a, 



in the external layer (next mesocarp) are arranged longitudinally, and b, in the internal layer are 



arranged transversely (circumferentially). x 230. 

 Fig. 5c?. Transverse section of endocarp from a hard mature follicle, showing the longitudinal direction in this 



section of the internal cells (o), and the transverse (circumferential) direction of the external cells (a). 



x52. 



Plate VI. 



Fig. 1. Longitudinal section of seed cut parallel with its flat surfaces, a, testa, bearing hairs, and prolonged 

 above to form the base of the stalk of the comose appendage ; b, tegmen, slightly developed ; c, 

 albumen ; d, root-cap of embryo ; e, radicle of embryo ; /, one of the two cotyledons. x 30. 



Fig. 2. Transverse section of seed, near position of the letter / in fig. 1. Lettering as in fig. 1; and/, coty- 

 ledons, g, raphe. x 50. 



Fig. 3. Longitudinal section of testa and tegmen. a, testa ; b, tegmen. x 150. 



Fig. 4. Internal view of testa, showing hoops of thickening on the primary membrane of each cell. x 350. 



Fig. 5. Longitudinal section of albumen. The starch granules have been stained with iodine, x 150. 



Fig. 6. Transverse section of testa, tegmen, and albumen, a, testa ; b, tegmen ; c, albumen. The starch 

 granules have been stained with iodine, x 150. 



Fig. 7. Transverse section of cotyledon. The lower part shows the natural appearance, and the upper part 

 (a) the appearance after treatment with |- per cent, osmic acid solution, indicating a large quantity 

 of oil. x 350. 



Fig. 8. Transverse section of cotyledon, after treatment with ether. x 350. 



Plate VII. 



Fig. 1. Semi-diagrammatic representation of longitudinal section of mature seed, cut parallel with the narrow 



diameter. Same lettering as in Plate VI. figs. 1 and 2. g,g, raphe, with vascular bundle of 



funiculus passing into the seed at the upper g. x 20. 

 Fig. 2. Interior of the dorsal aspect of a follicle, displayed by removing the pericarp. The seeds are nearly 



concealed by the fine and relatively long basal seed-hairs covering them, which, in the entire follicle, 



are interposed between the seeds and the endocarp. The upper portion exhibits the compressed 



stalks and tufts of the comose appendages. Natural size. 

 Figs. 3, 4, 5, and 6. Transverse sections of mature follicles in various stages of dehiscence, showing stages of 



opening of the follicle at its ventral surface, and of uncoiling of the placenta, p. Natural size. 

 Fig. 7. Crystalline groups of Strophanthin, slowly formed in a dilute alcoholic solution after the addition of 



ether, x 6. 

 Fig. 8. Crystalline Strophanthin (impure 1 ?) obtained by the evaporation of a watery solution of alcoholic 



extract of Strophanthus. x 195. 

 Fig. 9. Usual microscopic appearance of Strophanthin obtained by the process described at page 1008. x 52. 

 Fig. 10. Stropanthidin formed spontaneously in a solution of Strophanthin acidulated with sulphuric acid. 



Natural size. 



VOL. XXXV. PART IV. (NO. 21). 7 Q 



