this sacrament together
with the dimensive quantity of the host, the dimensive quantity of
Christ's body is extended beyond the quantity of the host, which
nevertheless is not without the substance of Christ's body.
Therefore, the substance of Christ's body will be in this sacrament
even outside the species of the bread, which is unreasonable, since
the substance of Christ's body is in this sacrament, only by the
consecration of the bread, as stated above (A. 2). Consequently, it
is impossible for the whole dimensive quantity of Christ's body to be
in this sacrament.

_On the contrary,_ The existence of the dimensive quantity of any
body cannot be separated from the existence of its substance. But in
this sacrament the entire substance of Christ's body is present, as
stated above (AA. 1, 3). Therefore the entire dimensive quantity of
Christ's body is in this sacrament.

_I answer that,_ As stated above (A. 1), any part of Christ is in
this sacrament in two ways: in one way, by the power of the
sacrament; in another, from real concomitance. By the power of the
sacrament the dimensive quantity of Christ's body is not in this
sacrament; for, by the power of the sacrament that is present in this
sacrament, whereat the conversion is terminated. But the conversion
which takes place in this sacrament is terminated directly at the
substance of Christ's body, and not at its dimensions; which is
evident from the fact that the dimensive quantity of the bread
remains after the consecration, while only the substance of the bread
passes away.

Nevertheless, since the substance of Christ's body is not really
deprived of its dimensive quantity and its other accidents, hence it
comes that by reason of real concomitance the whole dimensive
quantity of Christ's body and all its other accidents are in this
sacrament.

Reply Obj. 1: The manner of being of every thing is determined by
what belongs to it of itself, and not according to what is coupled
accidentally with it: thus an object is present to the sight,
according as it is white, and not according as it is sweet, although
the same object may be both white and sweet; hence sweetness is in
the sight after the manner of whiteness, and not after that of
sweetness. Since, then, the substance of Christ's body is present on
the altar by the power of this sacrament, while its dimensive
quantity is there concomitantly and as it were accidentally,
therefore the dimensive quantity of Chr