Calvinistic Methodists

"Which kind of church are you the minister of in Wales?"
"Really a Presbyterian Church, the name of the denomination - the strongest one in Wales - is the Welsh Calvinistic Methodist Church."
"Surely there's a mistake somewhere," I opined, "please say that over again."
Once more the name rolled out, a civil war in language. "I'm bewildered," was my confession. "Surely the term 'Calvinistic Methodist' is about as harmonious as 'white black-bird' or 'east-west wind'. Are they not antipodal terms?"
"Not at all - you evidently think that John Wesley was the only Methodist who ever lived. George Whitefield was a Calvinist - that's why he and Wesley quarrelled."