Describes an exploratory investigation of blind children's concepts of number, substance, length, area, weight, and volume conservation. Six children totally without sight or with only light perception were pretested, taught, and posttested twice using tasks specifically adapted for tactual presentation of materials. The children showed increased…

Explains the need to establish alternate communication devices between mothers and their blind infants. Mothers must demonstrate a natural ability to respond to auditory and manual cues, rather than visual cues. The importance of "tactual intimacy" is also stressed. (AS)