lust, hunger, and danger.  All warm-blooded animals derived from one living filament.  Cold-blooded animals, insects, worms, vegetables, derived also from one living filament.  Male animals have teats.  Male pigeon gives milk.  The world itself generated.  The cause of causes.  A state of probation and responsibility. V. 1. Efficient cause of the colours of birds eggs, and of hair and feathers, which become white in snowy countries.  Imagination of the female colours the egg.  Ideas or motions of the retina imitated by the extremities of the nerves of touch, or rete mucosum. 2. Nutriment supplied by the female of three kinds.  Her imagination can only affect the first kind.  Mules how produced, and mulattoes.  Organs of reproduction why deficient in mules.  Eggs with double yolks. VI. 1. Various secretions produced by the extremities of the vessels, as in the glands.  Contagious matter.  Many glands affected by pleasurable ideas, as those which secrete the semen. 2. Snails and worms are hermaphrodite, yet cannot impregnate themselves.  Final cause of this. 3. The imagination of the male forms the sex.  Ideas, or motions of the nerves of vision or of touch, are imitated by the ultimate extremities of the glands of the testes, which mark the sex.  This effect of the imagination belongs only to the male.  The sex of the embryon is not owing to accident. 4. Causes of the changes in animals from imagination as in monsters.  From the male.  From the female. 5. Miscarriages from fear. 6. Power of the imagination of the male over the colour, form, and sex of the progeny.  An instance of. 7. Act of generation accompanied with ideas of the male or female form.  Art of begetting beautiful children of either sex. VII. Recapitulation. VIII. Conclusion.  Of cause and effect.  The atomic philosophy leads to a first cause.

I. The ingenious Dr. Hartley in his work on man, and some other philosophers, have been of opinion, that our immortal part acquires during this life certain habits of action or of sentiment, which become for ever indissoluble, continuing after death in a future state of existence; and add, that if these habits are of the malevolent kind, they must render the possessor miserable even in heaven.  I would apply this ingenious idea to the generation or production of the embryon, or new animal, which partakes so much of the form and propensities of the parent.

Owing to the imperfection of language the offspring is termed a new animal, but is in truth a branch or elongation of the parent; since a part of the embryon-animal is, or was, a part of the parent; and therefore in strict language it cannot be said to be entirely new at the time of its production; and therefore it may retain some of the habits of the parent-system.