CONTENTS 



PAOS 



I. Introductory Remarks ------ l 



II. Some Remarks on the Morphology of Development - 17 



III. Fertilization and Oxidation ----- 25 



IV. Hydrolytic Processes in the Germination of Oil- 



containing Seeds - - - 39 



V. Some Earlier Observations on Natural Partheno- 

 genesis in Insects - - - - 43 



— ' VI. On the History of the Earlier Experiments on Artificial 



Parthenogenesis -------47 



VII. The First Experiments upon the Osmotic Activa- 

 tion of the Unfertilized Egg of the Sea-Urchin 

 {Arbada) - ------ bl 



VIII. The Improved Method of Artificial Parthenogenesis 



in the Sea-Urchin Egg - - - - - 65 



' IX. The Effect of Artificial Membrane Formation on the 



.Egg - - - - . - 73 



X. Further Examples of the Prolongation of the Life of 



the Egg by Lack of Oxygen - - - - 85 



XI. Further Experiments on the Action of the Hypertonic 



Solution after Membrane Formation - - - 95 



^XII. The Effect of the Agencies of Artificial Partheno- 

 genesis upon the Oxidations. The Cytological 

 Changes in the Parthenogenetic Egg - - - 113 



XIII. The Relative Physiological Efficiency of Various Isos- 



motic Solutions - . - - 127 



XIV. Chemical Constitution and Relative Physiological 



Efficiency of Acids - - - - 133 



XV. The Activation of the Unfertihzed Egg by Bases - 147 



