82 Journal of the ]Mitciiell Society [September 



The impermeabk' portion of a hard pea seed is located in the 

 cutinized layer as comi)ared -with the light line in sweet clover. 



N. C. College for Women, 

 Greensboro, N. C. 



LITERATURE 



1. BOLLET, II. L. The Agri. Vahie of Hard Seeds in Alfalfa and Clover 



Seeds. Paper read before Official Seed Analysts. 1910. 



2. Carruthers, "W. On Vitality of Farm Seeds. Journ. Eoy. Agric. Soc. 



Eng. 72: 168-183. 1911. 



3. COE, H. S. and Martin, J. N. U. S. Department Agric. Bull. No. 844. 



Professional Paper. 



4. Crocker, William. Role of Seed Coats in Delayed Germination. Bot. 



Gaz. 42: 265-291. 1906. 



5. Crocker, William. Mechanics of Dormancy of Seeds. Am. Jour of Bot. 



3: 99-120. 19] 6. 



6. Cross, C. F. and Bevan, E. J. Cellulose. London. 1916. 



7. Guppy, H. B. Studies in Seeds and Fruits. London. 1912. 



8. Harrington, G. R. Hard Clover Seed and its Treatment in Hulling. 



U. S. Department of Agric. Farmers' Bull. No. 676. 



9. Hass, Paul and Hill, T. G. Chemistry of Plant Products. 1917. 



10. Hiltnee and Kinzel. Hardness of Seed Coats of Leguminosae. Zentbl. 



Agr. Chem. 36: 38-84. 1907. (Review E. S. R. 19: 642). 

 n. Love, Harry H. and Leighty, C. E. Germination of Seed as Effected by 



Sulphuric Acid Treatment. Cornell Exp. Sta. Bull. No. 312. 



12. Pammel, L. H. On the Structure of the Testa of Several Leguminosae 



Seeds. Bull. Torr. Bot. Club. 13: 17-24. 1886. 



13. Pammel, L. H. Anatomical Characters of Leguminosae. Trans. Acad. 



S<-i. of St. Louis 9: 1899. 



14. Rose, D. H. A Study of Delayed Germination in Economic Seeds. Bot. 



Gaz. 59: 425-444. 1915. 



15. RosTRUP, O. Report of the Seed Control for 1896-97, p. 37. Copen- 



j.agon. 189S. (Review E. S. R. 10: 53-54). 



16. TuNMANN, 0. Pflanzcnmikroclieniie. Berlin. 1913. 



17. ZiMMEEMANN, A. Botanical Microtechnique. New York. 1893. 



EXPLANATION OF PLATES 

 Plate 5. MelUotus aJba. 

 Fig. 1. Ovule wall forty-seven hours after pollination and just before fertiliza- 

 tion. (xl500). 

 Fig. 2. Ovule wall after first division of the egg cell, (x 1500). 

 Fig. 3. Ovule wall five days after ]>ollination, suspcnsor well developed, (x 1500). 

 Fig. 4. Ovule wall six days after pollination, (x 1500). 



Fig. 5. Malpighian cells nine days after jjollination, cotyledons well developed. 

 (xl500). 



