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EXPLANATION OF THE ACCOMPANYING MAP. 

1. Scale 4, or 300 inches to one inch. 
2. Stones filled in with black ink are standing now, Their 
positions are taken exactly from Dr. Flinders Petrie’s map of 
Stonehenge, reduced. 
3. Stones marked with slanting lines are now fallen ; Nos. 54, 
57 and 58 are taken from Wood’s map. 
4. The marks, like arrows without the feather-—, attached 

to any stone, denote that the stone is inclining from the perpen- 
dicular, having shifted its position ; the amount of the inclination 
.is shewn by the length of the line ; see No. 56. 
5. The horseshoe of 19 small stones within the 5 trilithons is 
composed of stones brought from a distance. They are igneous 
rocks, and are often spoken of as blue stones. 
6. There were other blue stones, including a small eeiithon, 
most of which have disappeared, and as their original position and 
number cannot now be ascertained, only the few now standing 
are represented on the map. 
7. The small figures on the East and West line, and those in 
the dotted lines let fall or raised from that line as perpendiculars, 
show the exact lengths of the two containing sides of the right 
angled triangles, the hypothenuses of which are understood. 
From them the other angle at the East and West line can readily 
be found. Thus; the length of the perpendicular from the 
South stone is 228, and } of the divisions on my scale, and the 
length from that to the point where the alignment from 59 to the 
South stone crosses the East and West line is nearly 365. Then 

Log. 365 = 2°5622929 
Log. 228'+ Rad. = 12°3579322 
Log. Tan. 31°59’28" = 9°7956393 
