But I believe, with the New Testament for my guide, that immersion was not practised by the apostles themselves.

The word baptize had, even in the Saviour's time, to go no further back, come to mean a thing done irrespective of the mode.

How would it sound, "I have an immersion to be immersed with, and how am I straitened ?" &c.

"Are ye able to be immersed with the immersion that I am immersed with ?" I believe that sprinkling was the original mode of Christian baptism.

And it seems to me unlikely that God would appoint an ordinance, and not appoint, by precept or example, the mode of it.