Well the two cats have now seen each other, and continue to hiss. Mittens seems to have won the hissing contests because Bonnie has retreated back to her favorite spot out in the garden for now. Mittens is hiding behind my desk, but did come out long enough for me to put her new collar on her in case she decides to explore the garden and figures out how to scale the walls (I wouldn't put anything past her... last night she opened up the door to the bathroom cupboard and slept there on the second shelf with the light bulbs)
Here's Mittens with the light bulbs


Here's Bonnie keeping an eye on things from outside

And Mittens crouched, ready to hiss at Bonnie when she comes near
