How did Karl Lachmann influence the development of systematic textual criticism?

Karl Lachmann is widely recognized as a foundational figure in modern textual criticism, the methodology used to determine the definitive text of a written work. His influence on the development of systematic textual criticism is defined by several key contributions:1

• The Genealogical Method: While the origins of the genealogical, or stemmatic, method trace back to predecessors like J.A. Bengel, Lachmann is centrally associated with its formalization. He championed the use of a stemma codicum (family tree of manuscripts) to trace the relationships between witnesses and reconstruct the archetype, or the earliest inferable textual state.23
• Rigorous Methodology: Between 1820 and 1836, Lachmann clarified his systematic approach, establishing a school of thought that dominated textual studies for half a century. His work emphasized the power and penetration of scholarship, moving beyond the "received" texts of the past to apply scientific and historical rigor to editing.12
• Practical Exemplification: His editions of the Greek New Testament (1831) and Lucretius’s De rerum natura (1850) served as critical demonstrations of his method in action.12

Although his strict application of the genealogical method was later challenged for its potential rigidity, Lachmann’s work remains a cornerstone of the field, setting the standard for how scholars analyze and reconstruct textual traditions.24