This text is missing some spaces, please add them: Thefirsttwovolumescoverhisideasonthephilosophyoflogic,thethirdvolumepresentsatheoryofscientificdiscovery,whilethefinalvolumepresentshismethodologyofwritingtextbooks:
The first two volumes cover his ideas on the philosophy of logic, the third volume presents a theory of scientific discovery, while the final volume presents his methodology of writing textbooks :