404. CHuRCH: DEVELOPMENT OF EMBRYO SAC AND EMBRYO 
3. Goebel, K. Organography of plants. English Translation. Oxford. 
1900-05. 
. Guignard, L. Recherches sur le sac embryonaire des Phanéro- 
‘ l. 
games Angiospermes. Ann. Sci. Nat. Bot. VI. 13: 136-199. B 
aay Maes ate 
5. Hofmeister, W. Neuere Beobachtungen iiber Embryobildung der 
Phanerogamen. Jahrb. Wiss. Bot. 1: 82-188. pl. 7-10. 1858. 
6. Lechmere, A. Two embryo-sac mother-cells in the ovule of 
Fritillaria. New Phytol. 9: 257-259. f. 19. oO. 
7. Lindley, J. [Habranthus gracilifolius B Boothianus.] Bot. Reg. 
pl. 1967. 1837. ' 
8. McAllister, F. The development of the embryo sac of Smilacina 
stellata. Bot. Gaz. 48: 200-215. pl. 15. O 1909. 
n the cytology and embryology of Smuilacina racemosa. 
Trans. Wisconsin Acad. 17: 599-660. pl. 56-58. 1913. 
10. Schaffner, J. H. The embryo-sac of Alisma Plantago. Bot. Gaz. 
21: 123-132. pl. 9, 10. Mr 1896. 
A contribution to the life history and cytology of Erythronium. 
Bot. Gaz. 31: 369-387. pl. 4-9. Je 1901. 
12. Treub, M. & Mellink, J.F.A. Notice sur le développement du sac 
embryonaire dans quelques angiospermes. Archiv. Néerlandaises 
Sci. 15: 452-457. pl. 9, 10. 1880. 
13. Weinzieher, S. Beitrage zur Entwicklungsgeschichte von Xyris 
indica L. Flora 106: 393-432. pl. 6-7 +f. I-10. 1914. 
Explanation of plates 22 and 23 
All figures — where noted are Zeiss camera lucida drawings from microtome 
sections. A Lei und microscope was used for all drawings. In some cases 
the scale of magnification i is designated; in other cases the ocular and objective com- 
binations are given. 
Fic. 1, Archesporial cell, X 310 
Fic. 2. Ovule with two archesporial cells, & 300. 
Fic. 3. Uninucleate embryo sac, X 310 
Fic. 4. Two-nucleate embryo sac, X 200 
Fic. 5. Four-nucleate embryo sac, * 110 
Fic. 6. Eight-nucleate embryo sac, X 150. 
Fic Fertilized egg and pollen tube nucleus from fresh material; 1 ocular, 7 
objective. 
Fic. 8. Fused polar nuclei and pollen tube nucleus, X 600. 
Fic. 9. Proembryo, two-celled and as yet unattached; 4 ocular, 7 objective 
FIG. ro. embryo with suspensor and endosperm, from free-hand sec- 
tion of fresh material; 4 ocular, 7 objective, 
FIG. 11. Two-celled embryo, from fresh material cut on freezing microtome, 
