 “Is of a type with which” means “is sufficiently like those standard states of affairs with which”. Thus, for a statement to be true one state of affairs must be like certain others, which is a natural relation, but also sufficiently like to merit the same “description”, which is no longer a purely natural relation. To say “This is red” is not the same as to say “This is like those”, nor even as to say “This is like those which were called red”. That things are similar, or even “exactly” similar, I may literally see, but that they are the same I cannot literally see—in calling them the same colour a convention is involved additional to the conventional choice of the name to be given to the colour which they are said to be. (1950a: 122 fn.2)