Correction.
It has been called to our attention that the item on National Institute of Health Fellowships for training research personnel in tissue culture (Science, February 20, p. 185) should be clarified with respect to the following two points: (1) Eligibility for these fellowships is not limited to individuals connected with the Tissue Culture Commission but may apply to any properly qualified research worker. (2) Tissue culture research in the field of cancer is especially welcome, but the projects offered need not be limited to this area.