As far as I know, the question of whether you can put multiple spells on a scroll has never been conclusively answered. Well, I just noticed on pg. 204 of the DMG a table for determing the number of spells on a scroll. 
I guess that ends the debate
 
Of course, if this has been noticed before, please kindly disregard
				
			I guess that ends the debate
Of course, if this has been noticed before, please kindly disregard