┌1st. Of life and its functions.
│ ┌Of those relating ┌Animal functions.
│ │to the individual. └Organic functions.
│ │
│2d. Classification of │ ┌Functions of the male.
│ functions │Of those relating │Functions of the female.
│ └to the species. │Functions relating to the
│ │ union of the sexes, and
│ └ the product of this union.
│
│3d. Of the differences and relations that exist between the two classes
│ of functions.
│4th. Of the differences and relations that exist between the two orders
│ of the first class.
│5th. Of the differences and relations that exist between the three orders
└ of the first class.