GLOSSARY 315 



Ectoblast: 50. 

 Ectoderm: 20. 

 Egg-cell: 20. 

 Egois'tic instinct : 129. 

 EmbrySl'ogy: 39. 

 EmbrySn'ic : 49. 

 En'doblast: 50. 

 En do derm : 20. 



Environment : an organism's surroundings taken collectively. 

 Ex'cretory : referring to excretion, as excretory organs, the organs 

 which get rid of waste matter in the animal body. 



Fau'na (fawna) : 157. 

 Fertilized egg : 20. 

 Fission: 4. 

 FlageTla: 13. 

 Function: 37. 



Gan'glion (pi. ganglia) : a nerve-center composed of an aggregation of 



nerve-cells. 

 Gas trula : 50. 

 Gem mule: 20. 

 Generalization: 41. 



GebTogist: student of the structure and history of the earth. 

 Gregarious: 87. 

 Growth: 46. 



Habit: 139. 



Herbiv'orous : plant-eating. 



Hered'ity : 54. 



Hermaphroditic: 35. 



Hiberna tion : passing the winter in a death-like sleep. 



Homoge neous : of the same composition or structure throughout. 



Ileum: 42. 



Inorganic : not being nor having been a living organism ; not organic. 



Insectiv'orous : insect-eating. 



Instinct: 128. 



Intellect: 139. 



Intercellular : outside of and between the cells. 



Jeju num : 42. 



