INTRODUCTORY 7
PART A 9
1．A GENERAL SCHEME OF SCIENCE 11
1．1 Science and Observation 11
1．2 The Levels in a Science 21
1．3 Directed Action 30
1．4 Meaning 35
2．A PARTICULAR CASE：LINGUISTICS 40
2．1 Linguistics as a Science 40
2．2 Linguistics and Other Sciences 50
PART B 57
3．LINGUISTICS AND LOGIC 59
3．1 Three kinds of ＇Logical＇ 59
3．2 Chomsky＇s ＇Linguistics＇ 62
3．3 Logical Linguistics？ 88
3．4 Towards a ＇Descriptive Logic＇ 96