EXPLANATION OF THE PLATES. 



PLATE I. 



Fig. 1. The chalaza of the Citron, opposite to the umbilicus, 

 (Sect. 120.) 



2. Cotyledons with the radicle. Seeds destitute of albu- 



minous substance. The embryon erect, (121, S83.) 



3. Section of Cardamon seed, having the umbilicus turn- 



ed upwards. The mealy albuminous substance is 

 dotted. The vitellus is marked by lines. Within 

 this lies the embryon, having its upper (in this case 

 its lower) end bent into a hooked shape, (121, 385, 

 386.) 



4. Seeds of Cardiospermum Halicacahim with the heart, 



shaped strophiolus, (120.) 



5. Thick fleshy cotyledons wound within one another, 



(121.) 



6. Achenium of Centaurea ruthcnica, with its bristly 



pappus and lateral iimhilims, (109, 120.) 



7. Silicle of Thlaspi hursa^ (114.) 



8. Galbulus of Thuia orientalis^ (116.) 



9. ^ii'o\)\\us o{ Alnus incana, (116.) 



10. Section of the seed of Strelitzia reg'ma. The albu- 



rainons substance is fmcly dotted : the embryon is in 

 the centre, unevolved. A red tomcntum forms the 

 strophiolus, (strophiolus stuppeus, 25, 120, 121.) 



11. Section of a grain of Wheat, in the upper end of 



which is the superficial unevolved embryon lying on 

 the scuidhiin, by means of which it is connected 



