396 
KEY. S. HAUGrHTON ON THE JOINT-SYSTEMS OE 1KELAND 
If we arrange the 64 observations recorded in the preceding Tables according to their 
azimuths and the number of observations corresponding to each, we shall obtain the 
following : — 
Table III. — Joints of Donegal, arranged according to azimuths and number 
of observations. 
Azimuth. 
No. of observations. 
42 W. of N. 
1 
40 „ 
1 
25 „ 
2 
22 „ 
1 
20 „ 
2 
15 „ 
1 
10 „ 
9 
7 
1 
5 
4 
0 N.S. 
3 
5 E. of N. 
4 
7 „ 
1 
10 
2 
15 „ 
1 
30 
1 
40 „ 
1 
45 N. of E. 
2 
35 „ 
2 
30 „ 
3 
20 „ 
2 
15 „ 
1 
10 „ 
2 
7 „ 
2 
5 „ 
3 
0 E.W. 
2 
5 S. of E. 
1 
10 
5 
35 „ 
2 
40 „ 
2 
Total 64 
An inspection of this Table shows that, of the 64 observations, 24 are included in the 
angle between 10° E. of N. and 10° W. of N., and that 15 are included in the angle 
between 10° N. of E. and 10° S. of E., — making a total of 39 in 64, or 61 per cent, of 
the whole number of observations contained between these two limits. Dividing the N.S. 
observations equally between those that lie to the E. and W. of North, we find the 
following mean azimuths : — 
I. 7° 33' W. of N. from 15^ observations =24 per cent. 
II. 5° 32' E. of N. from 8J observations =13 per cent. 
In like manner, dividing the E.W. observations equally between those that lie to the 
N. and S. of East, we find the following mean azimuths: — 
III. 6° 7' N. of E. from 8 observations =12^ per cent. 
IV. 7° 51' S. of E. from 7 observations =11 per cent. 
