What thurst is?

Describe the beginning of man, and what causes it within the womb, and why a child of eight months cannot survive.
What sneezing is.
What yawning is.
Falling sickness.
spasm
paralysis
shivering with cold
sweating
hunger
sleep
thirst
lust

Leonardo Da Vinci
Върху етюд на череп
2 April 1489

"Leonardo Da Vinci, The flights of the Mind", Charles Nicoll