XI. 
XII. 
XIII. 
XIV. 
XV. 
TABLE OF CONTENTS 
PART I 
The Heliotropism of Animals and its Identity with 
the Heliotropism of Plants 
Further Investigations on the Heliotropism of Ani- 
mals and its Identity with the Heliotropism of 
Plants 
On Instinct and Will in Animals 
Heteromorphosis 
Geotropism in Animals 
Organization and Growth - 
Experiments on Cleavage - 
The Artificial Transformation of Positively Helio- 
tropic Animals into Negatively Heliotropic and 
vice versa 
On the Development of Fish Embryos with Sup- 
pressed Circulation 
On a Simple Method of Producing from One Egg 
Two or More Embryos Which Are Grown 
Together 
On the Relative Sensitiveness of Fish Embryos in 
Various Stages of Development to Lack of Oxygen 
and Loss of Water 
On the Limits of Divisibility of Living Matter 
Remarks on Regeneration 
Contributions to the Brain Physiology of Worms 
The Physiological Effects of Lack of Oxygen 
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