58 EMBRYOGENY OF Pinits Pinaster. 



4. Coulter, J. M. (1897). Notes on the fertilisation and 



embryogeny of Conifers. Bot. Gaz. 23; 40-4^^ pi. 6. 



5. Coulter, J. M., and Chamberlain, C. J. (1901). Morphology 



of spermatophytes. Part I. Gymnosperms. New York, 

 1901. 



6. De Bary, a. (1884). Comparative anatomy of the vegetative 



organs of the Phanerogams and Ferns, English transla- 

 tion. 1884. 



7. Ferguson, M. C. (1904). Contributions to the knowledge of 



the life-history of Pinus, with special reference to sporo- 

 genesis, the development of the gametophytes and 

 fertilisation. Proc. Washington Acad. Sci.. 6 : 1-202, 

 pis. 1-24. 



8. Hill, T. G., and De Fraime, E. (1908). On the seedhng 



structure of Gymnosperms. I Ann. Bot. 22 : 689-712, 

 pi. 35, figs. 1-8. 

 g. Hill, T. G., and De Fraine, E. (1909). On the seedling 

 structure of Gymnosperms. H. Ann. Bot. 23 : 189-227, 

 pi. 15. 



10. Hofmeister, W. (1862). Vergleichende Untersuchungen. 



English translation, 1862. 



11. Kildahl, N. J. (1907). Development of the walls in the 



proembryo of Pinus laricio. Bot. Gaz. 44: 102-107. pis. 

 8-9. 



12. Lyon, H. L. (1904). The emybrogeny of Ginkgo. Minnesota 



Botanical studies. 23 : 275-290, pis. 29-43. 



13. Morris, H. S. (1909). Note on an abnormal seedling of Wid- 



dringtonia ciipressoides and a brief account of the vascular 

 system of the normal seedling. Phil. Trans. Roy. Soc. 

 S.A. 1 : 411, 412, figs. I and 2. 



14. Saxton, W. T. (1909). Parthenogenesis in Pinus pinaster. 



Bot. Gaz. 47: 406-409, figs. 1-7. 



15. Saxton, W. T. (1909). The embryogeny of Encephalartos. 



(To appear in Bot. Gaz. 48.) 



EXPLANATION OF FIGURES IN PLATE 2. 



AH ligures drawn from microtome sections with the camera Uicida and 

 reduced in reproduction. All represent longitudinal sections of prothallus 

 or embryo. In all: — «= primary embryo, 6= secondary embryos, t-= coty- 

 ledons, ^=part of prothallus devoid of starch, 6'= original tip-cells, / = base of 

 Archegonium, g=periblem, /;=plerome, A = root-cap, / = stem-apex, ;;=free 

 nuclei, y = rosette, s=suspensor, / = embryonal tubes, a' = apical cell. 

 Fig. I. Suspensors beginning to elongate ( x 100). 



,, 2. Suspensors longer. Tip-cells divided (X42). 



,, 3. Two embryos, each on a simple suspensor ( x 140). 



,, 4. Three embryos, each on two suspensors, but with a single tip-cell 

 (X83). 



,, 5. Two embryos — normal (X42). 



., 6. Two embryos — normal. Each on four suspensors ( X42). 



,, 7. Two older embryos, not j-et separated ( x 100). 



,, 8. Two embryos. Tip-cell in one preparing to divide. Note embryonal 

 tubes ( x 170). 



J, 9 and 10. Embryos showing apical cell (?) (9 x 170 ; 10 x 140). 



