Share desktops between dual monitors

I'm using OS X Yosemite 10.2.2 on my MacBook Pro. I just hooked up a second monitor and have it in a dual configuration.  I see that I can make new desktops in Mission Control for each monitor independently — but what I would like to do is to be able to scroll through the same set of desktops on either monitor.  So then I would have, say, 4 desktops, and I could left/right swipe between them on either my retina display, or my external monitor.  This would allow, for instance, me to display "Desktop 1" on both monitors at the same time, if I choose.
Anyone know how to do this?

Go into *System Preferences* and adjust the Tracking speed under *Keyboard & Mouse*. Adjust it until you get a smooth transition between the two monitors.

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    Depth 8
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