Is what the priest holds in his hands at Mass really and truly God, and no longer bread?

Is what the priest holds in his hands at Mass really and truly God, and no longer bread?

Bibliographic Details
Main Creator:	Waller, John Thomas.
Format:	Book
Language:	English
Published / Created:	[Dublin] Irish Church Missions [c. 1850?]
Notes:	Physical description: [2] p. 19 cm.