OF THE OYTJLE AND SEED-COATS OE MAGNOLIA. 



109 



Fig. 12. 



Fig. 13. 



the nucleus of an unimpregnated ovule. The cells forming the 

 inner lining of the primine at this time hardly differ from the rest 

 except in their smaller size. Eig. 12 re- 

 presents an impregnated ovule, or form- 

 ing seed, of about a line and a half in 

 length; its natural size is indicated by 



the perpendicular line at the right of the ^ ^ ^» ^ I \K--\—b 



figure. The raphe, turned to- 

 wards the eye, appears more 

 prominent than in nature, ex- 

 cept when the body is a little 

 withered ; it is then as con- 

 spicuous as is represented. 

 Fig. 13 is a magnified vertical section of the same, answering to 

 that of fig. 9 : a, the primine, or outer seed-coat ; a', its inner 

 lining assuming a different texture and appearance; 5, the se- 

 cundine or inner coat, already beginning to adhere slightly to the 

 nucleus c. On the other side, d is the cord of vessels of the 

 raphe. A slice of the tissue through d, and extending into the 

 nucleus, sufficient- 

 ly magnified to re- L>->'^ r\ \Bm\ \£y y- 

 veal the structure, 

 is shown in fig. 14, 

 the parts of which 

 are corresponding- 

 ly lettered. The ^^^.14. 

 cord of spiral vessels, with some forming pleurenchyma, is stiU 

 found in about the middle of what becomes the fleshy coat of the 

 seed, while a stratum of narrow horizontal cells {a') are deve- 

 loping on its inner face. 



d—-\-. 



Fig. 16. Fig. 15. 



Our next stage exhibits the seed almost full-grown, and of the 



