72 Mr. Griffith on the Development of 



viscous tissue commences, which is, even in its early stages, of a green colour. 

 Just after the fall of the corolla no change of any importance has taken place. 

 There is a greater development of the viscous tissue, and the excavation is 

 larger and nearly filled with broken-up tissue. The canal leading from it 

 appears diminished, but is still distinct. Some time after tlie fall of the 

 corolla we find the excavation is considerably increased and partially occu- 

 pied by broken-up tissue*. The viscous tissue is considerably developed, and 

 the greater part of it contiguous to the ovarium has become of a beautifully 

 rich green colour. 



Soon after this a small cellular body appears attached to that part of the 

 excavation immediately opposite to the termination of the sphacelated line. 

 This is the rudiment of the ovniuni. When the fruit is about half formed the 

 above parts have only undergone an increase in size. Both layers of viscous 

 tissue are well developed, the green one being in intimate contact with the 

 ovary. The base or termination of the sphacelated line is still distinct. The 

 ovulum is between cordate and ovate, its circumference being tinged with 

 pink; and it now has the appearance of albumen. Occupying a niche in its 

 centre we observe the young embryo. It is at this period totally included in 

 the albuminous-looking body, and is suspended by a flat cellular funiculus 

 from the part of the envelope, corresponding to the termination of the sphace- 

 lated line ; it is oblong, cellular, and presents no trace of cotyledonary di- 

 vision f. 



The subsequent changes are confined chiefly to the embryo. As its deve- 

 lopment proceeds, the division of the cotyledons becomes manifest, and soon 

 extends throughout rather more than half of its length +. The funicle equals it 

 in length, and is as well as the embryo itself entirely cellular. As it advances 

 in size the embryo ceases to be oval, and appears as if pulled out into a more 

 elongated form, its base or radicle becoming at the same time thickened. The 

 division of the cotyledons continues to be apparent for some time, but ceases 

 to be so at length from the adhesion of their contiguous faces. There is, how- 

 ever, always a certain degree of obliquity at their apices, which enables us to 

 recal their original separation. No union takes place by their immediate 

 bases §. 



* See Tab. IV. fig. 4. + Ibid. fig. 5. \ Ibid. fig. 6. § Ibid. fig. 8 & 9. 



