OK. I want to try out some thoughts about this, but first I want to clarify something about demonstratives.
A proper name, according to Kripke, is a rigid designator. It picks out the thing named in all possible worlds. This does not mean, of course, that the thing named
occurs in all possible worlds. It merely means that,
if Banno exists in a world, the name must designate him and not some other. Importantly, Kripke points out that “the property we use to designate that man . . . need not be one which is regarded as in any way necessary or essential.” But at the same time, he says that the proper name itself won’t do as that property:
If one was determining the referent of a name like ‛Glunk’ to himself and made the following decision, “I shall use the term ‛Glunk’ to refer to the man that I call ‛Glunk’,” this would get one nowhere. One had better have some independent determination of the referent of ‛Glunk.’ This is a good example of a blatantly circular determination. — Naming and Necessity, 73
As we know, Kripke believes we should refer back to the origin story of a person in order to say what that “independent determination” is.
Now demonstratives are also rigid designators, according to Kripke. If I point out the window and say, “This cloud,” I have “baptized” the cloud and given it a rigid designation. The same caveat applies here as with proper names: The cloud may not appear in a given world, but
if it appears, the designation “that cloud” is rigid.
I have two questions about this.
1) Is the “origin story” here simply a matter of my pointing and declaring? Doesn’t that seem the same as simply declaring a proper name, which Kripke says is circular? Then, if the “independent determination of the referent” is something else in the case of “that cloud”, what is it? Do we have to start talking in terms of molecular structure? But that is very un-Kripkean; that would be like “using a telescope” to identify a table; it’s not how we designate things.
2) Presumably there can be a possible world in which “that cloud” occurs but I do not. Does the cloud remain rigidly designated? There seems something odd about this. Do we want to say that, because I appear in a different possible world to baptize the cloud, my action carries over in some way to a world in which I never did so? There must be a better way to understand this.
Clarifications and insights welcome.