The General Instruction of the Roman Missal has:
“286. If Communion of the Blood of Christ is carried out by communicants’ drinking from the chalice, each communicant, after receiving the Body of Christ, moves to the minister of the chalice and stands facing him. The minister says,
The Blood of Christ , the communicant replies, Amen, and the minister hands over the chalice, which the communicant raises to his or her mouth. Each communicant drinks a little from the chalice, hands it back to the minister, and then withdraws; the minister wipes the rim of the chalice with the purificator.
287 . If communion from the chalice is carried out by intinction, each communicant, holding a communion-plate under the mouth, approaches the Priest who holds a vessel with the sacred particles, with a minister standing at his side and holding the chalice. The Priest takes a host, intincts it partly in the chalice and, showing it, says
The Body and Blood of Christ . The communicant replies,
Amen , receives the Sacrament in the mouth from the Priest, and then withdraws.”
The heading for this section is “Communion under Both Kinds”. This “both kinds” terminology indicates that is only in exceptional circumstances that one may receive Communion in the form of wine, but not of bread. It has: “55. Those who cannot receive communion in the form of bread may receive it in the form of wine.” (In the liturgical book “Holy Communion and the Worship of the Eucharist Outside of Mass").
According to the 2004 Instruction
Redemptionis Sacramentum, n. 103, intinction is always permitted:
“As regards the administering of Communion to lay members of Christ’s faithful, the Bishops may exclude Communion with the tube or the spoon where this is not the local custom, though the option of administering Communion by intinction always remains. If this modality is employed, however, hosts should be used which are neither too thin nor too small, and the communicant should receive the Sacrament from the Priest only on the tongue.”
The full document is at
http://www.vatican.va/roman_curia/c...doc_20040423_redemptionis-sacramentum_en.html
[Excerpt from the English translation of
The Roman Missal , © 2010 International Commission on English in the Liturgy Corporation. Excerpt from the English translation of
Holy Communion and the Worship of the Eucharist Outside of Mass , © 1974 International Commission on English in the Liturgy Corporation. All rights reserved.]