John Dalton

The difference between the two kinds of vision is not in the eye, but in the brain.

I have been accustomed to consider the atmosphere as a mixture of gases, each of which retains its elasticity, and acts as an independent fluid.

The pressure or elastic force of a mixture of gases is the sum of the pressures or elastic forces of the several gases, each separately occupying the whole space.

Every particle of a gas is surrounded by an atmosphere of caloric, which repels other particles of caloric, but attracts the particles of the gas.

The number of elementary particles in a given volume of any gas is the same.

The weights of the ultimate particles of all simple bodies are different.

Chemical combination consists in the union of atoms in simple numerical ratios.

It is evident that the ultimate particles of all homogeneous bodies are perfectly alike in weight, figure, etc. In other words, every particle of water is like every other particle of water; every particle of hydrogen is like every other particle of hydrogen.

I see no reason to doubt that the ultimate particles of all homogeneous bodies are perfectly alike in weight, figure, etc.

The relative weights of the ultimate particles of gaseous and other bodies are the most important properties to be determined.

No two particles of the same kind of matter can differ in weight, figure, or any other property.

The elements are simple bodies, which cannot be decomposed by any means.

The number of atoms in a given volume of any gas is the same.

The force of attraction between particles is more or less powerful according to circumstances.

The ultimate particles of all homogeneous bodies are perfectly alike in weight, figure, etc.

If there are two bodies, A and B, which are disposed to combine, the following is the order in which the combinations may take place, beginning with the most simple: namely, 1 atom of A + 1 atom of B = 1 atom of C, binary; 1 atom of A + 2 atoms of B = 1 atom of D, ternary.

The atoms of a given element are identical in mass and properties; atoms of different elements differ in mass and properties.

I am persuaded that upon the subject of heat and cold, the prevailing opinions are very erroneous.

The investigation of the laws of chemical combination, and of the properties of bodies as influenced by them, constitutes the fundamental object of chemical philosophy.

An inquiry into the relative weights of the ultimate particles of bodies is a subject, as far as I know, entirely new.