Oil the Ghemical and Natural History of Lupuline, 213 



Fig. 12, The same gland, seen on the face, and a little farther advanced. 

 Fig. 13. Gland more advanced, in which the four cellules of figures 10, 11, 



and 12, are subdivided parallelly to the ray, and parallelly to the 



circumference ; each of the cells is indicated by a a a a. 

 Fig. 14. Gland in which the utricular multiplication is still more advanced. 



The four mother cells of fig. 10 are still visible, and indicated by 



a a a a. 



Fig. 15. Shows the aspect which the glands present when they have acquired 

 a somewhat considerable size ; e, epidermis ; I, the gland. 



Fig. 16. Glands more advanced. The edges of the discoid glands, as seen in 

 preceding figures, are here raised, forming cupules, I, I ; e, epi- 

 dermis. 



Fig. 17. Cupule from the internal (or upper) surface of which the cuticle d is 

 detached, and elevated by the secretory products. 



Fig. 18. Lupuline, which has acquired its complete development ; c i, secret- 

 ing cupule or proper gland, surmounted by the cuticle c s, raised 

 up by the products of secretion. 



Fig. 19. Grain of lupuline enlarged; c i, cupule or gland proper; i, point of 

 attachment ; c s, elevated cuticle. There is seen on this last the 

 impression or trace of the cellules of the cupule, on the cavity of 

 which this cuticle was applied. 



Fig. 20. Longitudinal section of a grain of lupuline ; c i, cupule composed of a 

 single layer, which secretes the contained liquid; c s, cuticle de- 

 tached from the internal surface of the cupule by the secreted 

 liquid. 



The figures are from the pencil of M. Trecul. 



Remarks on the Sexual Changes in the Infioresence of 

 Zea Mays. By Mr John Scott.* 



The florets of the Indian corn, Zea Mays, as is well 

 known, are unisexual, and so placed that the male florets 

 form a terminal panicle, or raceme, and the females in- 

 ferior lateral spikes. In the male panicle the spikelets 

 are two-flowered ; both florets perfect and characterised by 

 two glumes, two squamulee, and three stamens. In the 

 female spike, the spikelets are also two-flowered, but in this 

 case the inferior floret is neuter ; two palese alone being 

 developed, the superior fertile, and possessing two or three 

 palese, an oblique, sessile ovary, and a long compressed 

 style, bifid, and pubescent at the apex. 



In the abnormal specimens which I now submit to the 

 Society, the male and female florets, in place of being 



Read before the Botanical Society of Edinburgh, 10th December 1863. 

 ^'E\V SERIES. VOL. XIX. NO. II. APRIL 1864. 2 £ 



