Abstract
Thin sections of tissue cultured cells, mainly fibroblasts and epithelia of irises from chick embryos were studied with the electron microscope.
It was found that the mitochondria with their cristae mitochondriales were present in the cells examined.
The technique how to obtain the ultrathin sections of tissue cultured cells was explained and discussed: many difficulties were encounterd in the removal of cultured tissues from the glass substrates and in the exclusive collection of new grown tissues.
