133

Logic 133

determine in the mind of the auditor corresponding signs.
The importance of the above divisions although they are new has been acknowledged by all logicians who have seriously considered them.

At this point I interpose a psychological chapter not for the purpose of introducing psychological matter into logic but for the purpose of making its arrelevancy quite clear.
All our thoughts are signs and I here consider how they are so and show that it is in their character as signs that logic as applicable to them.
Further logic is applicable to all signs whether they are directly mental or not.

Logic is the science of the general necessary laws Signs and especially of Symbols.
As such it has three departments.
Obsistent logic, logic in the narrow sense or Critical Logic is the theory of the gene-