320 INTRODUCTION TO CYTOLOGY 



and physico-chemical data must be secured before any theory ad- 

 equately harmonizing all the observed phenomena of parthenogenesis can 

 be formulated. 



Bibliography 13 



Apogamy; Apospory; Parthenogenesis 



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1886. Ueber die Eireifung bei Insekten. Biol. Cent. 6: 554-559. 



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megalocephala und Ascaris lumbricoides. Jen. Zeitsch. 21: 423-515. pis. 25-28. 

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 BROWN, E. D. W. 1919. Apogamy in Camptosorus rhizophyllus. Bull. Torr. Bot. 



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 DRUERY, C. T. 1884. Observations on a singular mode of development in the lady- 

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