Ueber die Analogie in der Structur und dem Wachsthum der Thiere und Pflanzen.

Schwann’s three-part preliminary application of Schleiden’s “watch-glass” cell theory to the genesis of animal cells. Schleiden communicated the theory to him verbally. This paper actually pre-dates Schleiden’s first publication (No. 112) but Schwann gives Schleiden full credit for the Uhrglastheorie. English translation with commentary in L.J. Rather, P. Rather, and J.B. Frerichs, Johannes Müller and the nineteenth century origins of tumor cell theory, Canton, Mass., [1986].