Synthesized answer
The central thesis of this text, according to the provided snippets, concerns the "Wirkung der Schnürbruste" (Effect of tight-lacing) on the human body [1]. Specifically, it discusses the impact of tight-lacing on the "Gestalt und den Wuchs des menschlichen Körpers" (form and growth of the human body) [1].
The text also notes that the chest cavity has a cone shape, directed downwards [1]. However, the provided snippets do not offer a comprehensive statement of the central thesis beyond its focus on the effects of tight-lacing on the body's form and growth.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: S. Th. Sömmerring über die Wirkungen der Schnürbrüste by Samuel Thomas von Soemmerring Categories: Cornet Pages: 86 Snippet: Mit einer Kupfertafel Samuel <b>Thomas von Soemmerring</b>. <b>Wirkung</b> der Schnürbruste auf die Gestalt und den Wuchs des menschlichen Körpers . : § . 74 . Wir sehen , daß der Brustkorper eine mit der Spike nach bemgerichtete Kegelform hat , alle ...