1. A comparative study of the visual system in the diurnal ground squirrel, Citellus tridecemlineatus tridecemlineatus and in the nocturnal guinea pig, Cavia cobaya

   • Prabhaker Gopal Vaidya

   OriginalPaper Pages: 505 - 521

2. L'ultrastruttura delle cellule della granulosa nelle varie fasi di maturazione del follicolo ooforo

   • M. P. Franceschini
   • A. Santoro
   • P. Motta

   OriginalPaper Pages: 522 - 532

3. Die Entstehung der Randleistenzähne der Wirbelkörper

   • Karl Theiler

   OriginalPaper Pages: 533 - 542

4. The hypependymal microglia cell

   • Jan Cammermeyer

   OriginalPaper Pages: 543 - 561

5. Electron microscopic observations on the development of S-A and A-V nodal tissues in the human embryonic heart

   • Akio Yamauchi

   OriginalPaper Pages: 562 - 587

6. Die vorgeburtliche Entwicklung der Gonaden der Ratte

   • W. Schmidt
   • Th. v. Kreybig

   OriginalPaper Pages: 588 - 600