The simple test was to take a length of roving, split it into two and lay the two pieces on top of each other in the palm of the hand with the fibers of each layer perpendicular to each other. Add a little soapy water and light agitation, tuck the wispy ends in towards the center, and viola! Felt happens!
The Cotswold roving felted quickly--they all felted quickly; 2 to 3 minutes tops--and made a dense felt. The Romney took a bit more work and is less dense and more springy than the Cotswold. The pin drafted Romney was more irregular and more poorly interconnected than the roving form. The brown wool is a beautiful fiber and I think it's a Romney cross. It felts nicely, but I'm not sure if it will end up being felted or spun!
Along with the samples, I took my new tool, a felting stone, and wet felted the purple hat I've been making. The hat was first needle felted, then wet felted by hand, but ended up being too big. I repeated the needle felting, but had to work up the energy to do the wet felting again! The stone sped up the wet felting process significantly!
Here's the hat drying on a small beach ball on a plastic container (ok, so it's really makeshift, but it works! :) An the blue oval with rectangles is the felting stone.
It looks great on my cone of yarn, but I can't wait to see if it looks good on it's intended owner!