Dr. Carrel's immortal cells

The authoritative historical investigation of Carrel's chick-heart tissue culture experiment. Witkowski examines the technical methods of the culture, argues that the embryonic nutrient extract used to feed the culture was prepared by homogenizing embryos without specifying centrifugation speed, and concludes that residual viable embryonic cells in the extract were almost certainly introduced with each feeding — effectively reseeding the culture rather than sustaining the original cells indefinitely. Witkowski cites a 1930 anecdotal account by Ralph Buchsbaum, who reported that a laboratory technician acknowledged adding embryo cells to maintain the culture. The paper also documents the inability of other laboratories to reproduce Carrel's results and situates the immortal-culture claim within the broader context of Carrel's public authority and the cultural enthusiasm for cellular longevity in the early twentieth century. This is the primary disconfirmation source for the technical claims of the case.