24 INTRODUCTION TO EMBRYOLOGY OF ANGIOSPERMS 



(especially gametogenesis and apomixis), work on which is being 

 continued at present by K. V. 0. Dahlgren, F. Fagerlind, A. Hakans- 

 son, H. Stenar, and A. Gustafsson. Among workers from other 

 countries may be mentioned the names of A. Chiarugi and the late 

 E. Carano from Italy; A. Ernst from Switzerland; H. D. Wulff 

 from Germany; and the late J. M. Coulter and D. S. Johnson from 

 the United States. During recent years there has also been con- 

 siderable activity in this field in India, Japan, and Australia. 



Of particular interest is the origin of the new science of experi- 

 mental embryology, dealing with problems of storage and viability 

 of pollen, effect of environmental factors on pollen tube growth, 

 control of fertilization, production of seedless fruits, embryo culture, 

 and artificial induction of parthenogenesis and adventive embryony. 

 Here embryology stands in intimate relation with physiology and 

 genetics, and promises to offer many opportunities and openings 

 for the future. 



References 



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 . 1844. Quatrieme reunion des naturahstes italiens. Padua, 1843. Flora 



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 Aristotle. "The Works of Aristotle." Engl, transl. by J. A. Smith and W. D. 



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