Go to:http://dl.clackamas.edu/ch104-04/dalton's.htm
that's where I found my answer
i think he discover atomic theory.
John Dalton. He put forward the atomic theory in 1808.
Dalton is credited for his expanding and formulating the modern atomic theory, but it was Jouseph Louis Proust and Antoine Lavoisier who are cited as initially discovering it.
john dalton developed the atomic theory , which he published in 1803
John Dalton created the atomic theory. He also worked on gas laws in his life along with the study on color blindness.
John Dalton developed the atomic theory.
John Dalton
John Dalton
1803
John Dalton first pursued research into atomic theory. He was the first person to propose the existence of the atomic structure.
Atomic theory was founded by John Dalton. He proved this theory in 1803.
scientific method used in the development of atomic theory