Nov., 1905.] Life History Sanguinaria canadensis. 
385 
The above paper was prepared in the Department of Botany 
of the Ohio State University as a minor for the degree of Master 
of Arts. The work was done under the direction of Associate 
Professor J. H. Schaffner, to whom the writer wishes to express 
his sincere thanks for the kind assistance and suggestions., 
without which the paper could not have been completed. 
DESCRIPTIONS OF PLATES. 
All drawings were outlined under a camera lucida with the 
following optical combinations: 
Bausch and Lomb — 1 oc., j obj. — Fig. 1. 
Bausch and Lomb — 1 oc., J obj. — Figs. 20, 21. 
Bausch and Lomb — J oc., J obj. — Figs. 2-8, 12, l.S-17, 22, 22. 
Bausch and Lomb — 2 oc.. ^ obj. — Figs. 18, 10. 
Leitz — 4 oc., 7 obj. — Fig. 10. 
Leitz — 6 oc., 7 obj. — Fig. 14. 
Zeiss — 18 oc.. Leitz 7 obj- — Figs. 9, 12. 
Zeiss — 18 oc., Leit.z 2 obj. — Fig. 11. 
Fig. 1. Section of young ovularv, showing incipient ovules. Killed 
10-6-’04. 
Fig. 2. Archesporial cell. Killed 10- 6-’04. 
Fig. 2 Megasporocyte with two parietal cells. Killed 12-9-’04. 
Fig. 4. Megasporocyte with three parietal cells. Killed 2-12-’0.5. 
Fig. .5. iUegasporocyte with parietals divided. Killed 2-l-’0.5. 
Fig. (). First division c4' megasporocyte. Killed 2~12-’05. 
Fig. 7. Four megaspores and parietal cells. Killed 2-22-'0.5. 
Fig. 8. Four megaspores showing tetrad arrangement. Killed 
2-22-0.7. 
Fig. 9. Eight celled embryo-sac. Killed 2-28-’(),7. 
Fig. 10. Embryo-sac with oospore. Antipodals with two nuclei. 
Killed 4 10-'04. 
Fig. 11. Outline of ovule with oospore. Killed 4-10-'04. 
Fig. 12. ( lospore with remains of synergids. Killed 4-lG-'04. 
Fig. 12. Two-celled embr 3 ’o. Killed .5-12 -’04. 
Fig. 14. Three-celled embryo. Killed .5-16-'04. 
Fig. 1.5. Young embrvo showing eight cells in section. Killed 
,5-22-'04. 
Fig. 10. Spherical embryo with long suspensor. Killed .5-29-’04. 
Fig. 17. Degenerating antipodals. Killed ,5-29-’04. 
Fig. 18. Embryo showing large suspensor and cotyledons at the time 
the seed falls. Killed 0- 6-'04. 
Fig. 19. vSection of stamen with microsporoevtes and tapetal cells. 
Killed 10- 0 '0,5. 
Fig. 20. Section of microsporangium showing microsporoevtes just 
before formation of tetrads. Tapetal cells with two nuclei. Killed ll-9-’0.5 
Fig. 21. Microspores with remains of tapetum. Killed 12-9-'05. 
Fig. 22. Single microspore. Killed 12-9- 05. 
Fig. 22. Pollen grain. Killed 2-22-’05. 
