372 BOTANICAL GAZETTE [November 



Angiospi 



men. T 



41- Shoemlaker, D. N., Development of Hamamelis virginiana. Box. Gazette 



39:248-266. pls.6,'/. 1905. 

 42. SmalLj J. K.J Flora of the southeastern United States. 1903. 



43- Str.\sbijrger, E., Ueber Befruchti 

 44. , Die Angiospermen und die 



agiospermen und die Gymnospermen. Jena. 1879. 



45. 3 Einige Bemerkungen zur Frage nach der doppelten Befruchtung 



bei den .\ngiospermen. Bot. Zeit. 58:290-316. 1900. 



46. WieganDj K. M., Development of the microsporangium and microspores in 

 Convallaria and Potamogeton. Box. Gazette 28:328-359. pis. 24, 25. 



1899. 



47. Wilson, E. B., The cell in development and inheritance. 1902. 



EXPLANATION OF PLATES XXW-XXVII 



All figures were made with Bausch and Lomb camera lucida; figs, ji and 

 46 with Leitz no. 2 ocular and no. 7 objective; figs. 61 and 62 with no. 4 ocular 

 and no. 7 objective; all others with Leitz no. 4 ocular and B. and L. tV objective; 

 details were filled in with a Zeiss apochromatic ocular and 2^^ objective- 



The abbreviations used are as follows: c, chalazal daughter cell and nucleus; 

 e, egg; em, embryo; end^ endosperm; g^ generative nucleus; gc^ generative 

 cell; w, micropylar daughter cell and nucleus; megy megaspore nucleus; p, 

 polar nucleus; pe, primary endosperm nucleus; s, synergid; /, tube nucleus; 

 6y male nucleus. 



PLATE XXIV 



Fig. I. C spectahile. Ovule with mother cell in synapsis. 

 Fig. 2. C. parvifloriim. Mother cell with well-organized spirem showing 

 distinct chromomeres. 



Fig. 3, C, spedabile. Nucleus of mother cell, with a few threads showing 

 beginning of pairing. 



Fig. 4. C, candidunt. Pairing of threads very evident throughout the nucleus, 

 but only a few threads shown. 



Fig. 5. C- spcctabile. Synaptic knot forming; pairing of threads evident. 



FiG^, 6. C. parviflorum. Synaptic knot further advanced; threads in pairs 

 and seemingly attached in places to nuclear membrane. 



Fig. 7. C. pubescens. Synaptic knot complete. 



Fig. 8. C. spedabile. Recovery from sjTiapsis; lines of cytoplasm suggest 

 multipolar spindle. 



Fig. 9. Same. Shortening of thread; double nature evident at cut ends; 

 lines of cytoplasm probably related to spindle formation. 

 Fig. 10. C. pubescens. Chromosomes formed. 



