Birds' -Nesting Season. 



63 



and thirty-eight or forty feet at the top. It is 

 bearded on the outside with a venerable growth of 

 grey lichen, and tapers gradually from the bottom, 

 until, within a few feet of the top, it slightly widens 



THE BROCH OF MOUSA SECTION. 



again, so that the actual top almost imperceptibly 

 overhangs. 



It is not easy, without going into too much detail, 

 to give an intelligible description of a building so com- 

 pletely at variance with every modern idea ; but the 

 very rough sketches given above and on the next page 



