In the New Testament there is reference submersion, immersion and affusion. It is necessary to distinguish between the first two. He then discusses surviving fonts and what suggestions they make about the practice of baptism in that place at that time. Many such baptisteries were separate from the church building itself. It is wrong to think baptisms were performed in the presence of the congregation. Greater study needs to be made of baptisma. Infant baptism is discussed.
The Archaeology of Baptism
Volume 02, Number 02 Nov 1972, p55