Mystery Stone at Powerscourt!

Mystery Stone at Powerscourt!

I saw this stone recently at Powerscourt, just beneath the Pepper Pot Tower. I took a photo to try to make out the engraving, but the last lines are difficult to make out. Has anyone any idea what it is about? I need a high-res photo to try to make it out, if anyone is knocking around that way in the next while…! What I can make out so far is:

Location of mystery stone...! Click to see full size.

 

In Loving Memory
of my dearest friend
Colonel Herbert C Laverton OBE [see comments below]
The Black Watch
Died 10th Jan 1923
——
This stone is placed
in the valley
in which he worked so often
and ________ so well
???