REMOVE

1. Atoms

WHAT

1. Chemistry (3)
2. Physics (1)

WHERE

1. England: Greater Manchest … (3)
2. England: Devon (1)
3. England: Greater London: … (1)

WHO

1. Clifford, William Kingdon … (1)
2. Dalton, John, 1766-1844 (1)
3. Roscoe, Henry E. (Henry E … (1)
4. Tyndall, John, 1820-1893 (1)

WHEN

1. 19th Century CE (3)
2. 1875? (2)
3. 1873? (1)