On the second part of your query, there is a brilliant article by T. M.  
Humphrey, 'The Theory of Multiple Expansion of Deposits: What it is and  
Whence it Came', Federal Reserve Bank of Richmond Economic Review (1987)  
3-11, tracing the history of the banking multiplier. Also see D. Laidler,  
_Fabricating the Keynesian Revolution_. I have an article forthcoming in  
the festschrift for Augusto Graziani which deals with this question too.  
I'll send it to you off the list. 
 
I doubt if there is much connection, except formal arrangement, between the banking and
Keynesian multipliers. There is nothing in the historical
chapters in Hugo Hegeland, _The Multiplier Theory_ , 1954, Kelley reprint  
1966, for example. I would be delighted if someone can find evidence of a  
connection. 
 
Victoria Chick