How many buffalo hides passed through dodge between 1872 and 1876?

Dodge City is in Kansas, United States. It was named Dodge after the name of the Fort Dodge which is near to that place. People lived in early days in Dodge City are used to trade buffalo bones and hides. When the railroad was arrived there, cattle trade increased in the Dodge City. Between 1872 and 1876, an estimated amount of 850000 buffalo hides passed through Dodge. 

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.

answer; i believe the correct answer is (8) eight.