Jim, nice to see your comments and question. Also interesting timing, I have just started a stone wall under the building attaching the house and barn. I have been wondering if I should use mortar or not. I started with a little dry premixed lime from Virginia Lime Works, I had some left over from a different job, laying the stone with mortar. Laying the stone with no mortar is much more relaxing, I can now feel better about it and point later. I will use a bed of mortar to set the sills on. The mortar will be to keep the cold winter drafts at bay.

Tim