32 
the stars, Stonehenge no longer answered some of the purposes 
for which it had been founded. The Greeks had adopted with 
ardour the Metonic Cycle, discovered by them B.c. 430, and they 
reformed the old Sun Temple by the addition of the inner horse- 
shoe of blue stones, which represented that cycle, for they 
were in number 19. The stones that are.left of this horseshoe 
will seem to afford some proof of this intention, when we 
observe that the eleventh stone is cut with peculiar care, 
and has a groove worked in it from top to base; and 
when we consider that the virtue of the Metonic Cycle 
consisted in this, namely, that it brought the months and 
the years into accord, seeing that 19 years of 365°24224 
days each comprise 6,939 whole days; and 235 lunations of 
29°5305 days each comprise the same number of days; and 
when we find that in 11 years this accord is almost brought 
about, since there are 4,017 days in 11 years, and 136 lunations 
comprise 4,016 days. Each of the 2nd, 5th, 7th, 10th, 12th, 15th 
and 17th years in each cycle contained 13 months and each alter- 
nate intercalated month had 31 days, each of the others of those 
months being a month of 30 days. I have no means of knowing 
how many blue stones were in the outer circle, therefore I have 
omitted them from my map together with the small trilithon, 
also of blue stones. Perhaps this was erected in honour of the 
extra day which had to be intercalated at the end of every 4th 
year in each cycle of 19 years. But I know not exactly where it. 
stood. I may add that Mr. Barclay in his book has something to- 
say about this small trilithon, and it is his opinion that the outer 
blue stone circle was connected with the days of the week. As. 
to how or why the blue stones came to be imported, I imagine 
they are native to Brittany or Normandy, whence they might 
easily have been brought as ballast in Greek ships, which took 
back tin in their stead from Poole or Christchurch, and from the 
latter port they might easily have been taken in rafts to 
Amesbury. 

