This document contains the original judgment from the Calcutta High Court in the case of Jaharlal Pagalia vs. Union of India, dated 20 May 1958. The judgment primarily addresses an application for amendment of the plaint, specifically concerning the interpretation of 'cause of action' in relation to Section 80 of the Code of Civil Procedure. It delves into various judicial precedents to define and distinguish 'cause of action' for both the basis of a claim and jurisdictional purposes. This judgment is crucial for legal practitioners, students, and anyone researching Indian civil procedure and case law.