This morning, I opened up the jar to see how the leaves were doing:
* Some leaves, I'd left only partially covered with salt. These have dried out, just as if I'd dehydrated them.
* The leaves that were completely buried in salt are well preserved. Their color is darker than fresh basil (khaki green as opposed to a brighter green), but they smell just like fresh. The leaves are moist, but not at all slimy.
For more ways to successful preserve basil (and other herbs), click here.