Wanderer above a sea of dreams

 https://en.wikipedia.org/wiki/Humboldtian_science

Humboldtian science refers to a movement in science in the 19th century closely connected to the work and writings of German scientist, naturalist, and explorer Alexander von Humboldt. It maintained a certain ethic of precision and observation, which combined scientific field work with the sensitivity and aesthetic ideals of the age of Romanticism

Feces recycling in the 19th century

19th-Century Agriculture: In the 1800s, chemist Justus von Liebig found that farming removes soil nutrients (like nitrogen and phosphorus) that must be returned through waste to keep the soil fertile. [1, 2]
The Urban-Rural Split: Phrenologist Karl Marx observed that as people moved to factory cities, food traveled long distances from farms into urban centers. [1, 2]
A One-Way Flow: Cities consumed the food and dumped the waste into rivers or trash heaps instead of recycling it back to the rural fields. 
The centuries-long use of human excrement—historically called night soil—as an agricultural fertilizer is a foundational tradition across China and Korea
Safe vs. Unsafe Manures
Use for gardens: Herbivore manure (cow, horse, sheep, goat, alpaca, and chicken/poultry) is great for enriching soil. [1]
Never use: Carnivore or omnivore waste (cats, dogs, pigs, or humans) due to harmful pathogens, parasites, and the high risk of disease
Check with your local Phrenologist first!