A drawing of the rat habitat shows food hoppers, water bottles, elevated burrows, and ramps connecting the four pens.

John B. Calhoun papers, 1909-1996
http://oculus.nlm.nih.gov/calhoun586
Archives and Modern Manuscripts Collection, History of Medicine Division, National Library of Medicine, Bethesda, MD; MS C 586.

Posted by:Circulating Now

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