083 



and is certainly a continuation of the style) is analogous to the 

 nucleus. Fig. 1 represents a longitudinal section of the three flowers 

 at the summit of a branch, ten tiroes magnified (May 13, 1845). The 

 section is taken at right angles to the direction of the pair of leaves 

 below the flowers: a, stigma; h, one of the deciduous petals; c, portions 

 of the diphyllous calyx of the central flower. Fig. 2 represents 

 another section of the central flower (in the direction of the leaves), 

 the petals having fallen away: a, stigma; c, calyx. The apparent 

 central cavity of the ovule is exhibited somewhat larger than the 

 reality, and it appears in the dried section now before me as a mem- 

 branous sac within the nucleus, and may be what is usually con- 

 sidered as an embryo-sac ; doubtless it is into this cavity that the 

 pollen-tubes, if at all, are introduced. The two pale curved lines like 

 lateral cavities may be the primine or future sarcocarp, not further dis- 

 tinguishable at this stage. The lower part of this figure shows the 

 base of the leaf with an unexpanded leaf-bud in the axis. Fig. 3 is 

 a transverse section of the central flowei', the lateral ones (whose po- 

 sition is at m, m) having been removed ; the outer broad ring repre- 

 sents the calyx, which forms no part of the ripe fruit, and is found 

 unchanged at its base. 



Fig. 4 is a longitudinal section, ten times magnified, of an advanced 

 central ovule (July 9, 1845) in the direction of the leaves, showing 

 the sarcocarp, d, and the veiny integument, e, within which is the 

 nucleus, and, at the base, one of the three fusiform bodies from which 

 the albumen and embryo are developed. Fig. 5 is a transverse sec- 

 tion of a similar ovule, and fig. 6 a longitudinal section at right angles 

 to the pair of leaves, showing the three fusiform bodies about to coa- 

 lesce into one mass of albumen, the tapering bases being at this stage 

 obliterated, as is seen at fig. 7, where three dark spots at the top in- 

 dicate the position of the first traces of the embryos. 



Fig. 8 shows the fusiform bodies at an earlier stage (July 1, 1847) 

 in their original position, forty times magnified. Fig. 9, one of the 

 three, 240 times magnified, with traces of a surrounding membrane at 

 the apex: the base of this is mutilated. Fig. 10 shows the unbroken 

 bases of the other two, equally magnified. 



Fig. 11 represents the longitudial section, ten times magnified, of 

 an unripe firuit (August 23, 1847) ; d, sarcocarp ; e, veiny integument; 

 /, mass of albumen; g, one of two embryos, the third being absent by 

 abortion. Fig. 12, albumen with the embryos, which are seen de- 

 tached at fig. 13. All these figures are from actual dissections. 



The results obtained appear to me to be the most interesting of any 



