XVI 



TRANSLATOR'S PREFACE. 



sperm-cell the pollen. The cases seem to me to have a strict 

 analogy, and no more simple way could be found of mastering 

 the details of the reproductive phenomena of animals, than by 

 studying those in plants. 



Perhaps these general remarks will be better understood by 

 the aid of the following diagram : 



GENESIS. 

 Growth Reproduction Generation. 



HOMOGENESIS 



(Reproductive force acting through 

 similar cells.) 



It is represented in 

 A. Plants by Phytoids. 



1. Isophytoids. 



Buds. 



2. Allophytoids. 



Bulbilli. 

 Bulbs. 

 Sporules, &c. 



B. Animals by Zooids. 



1. Isozooids. 



Gems, or buds. 



2. Allozoids. 



" Nurses " (Steenstrup). 

 " Agamozooids " (Huxley). 

 " Virgin Aphides " (Owen). 

 "Agamic eggs" (Lubbock). 

 " Drone bees " (Siebold). 



HETEROGENKSIS 



(Reproductive force acting through dis- 

 similar cells, sperm-cells and germ-cells.) 

 It is represented in 



A. Plants by 



1. Gynophytoids. 



Female flowers. 

 Pistillidia, &c. 



2. Androphytoids. 



Male flowers. 

 Antheridia, &c. 



3. Androgynophytoids. 



Hermaphrodite flowers. 



B. In animals 



1. Gynozooids. 



Females. 



2. Androzooids. 



Males. 



3. Androgynozooids. 



Hermaphrodites. 



8, SAVILE Row, 



August 24th, 1857. 



