380 
MacDougal. — The Mechanism of 
Length of intervals. 
Base. Tip. 
Total 
lengths. 
Mar. 2, 10 a.m. 
33 3 > 33 
33 4 > 33 
I 
1 
1 
1 
1 
1 
I 
1 
1 
1 
1 
*5 
1 1. 5 cm. 
1*6 
1.6 
i *9 
1.9 
i *9 
2 
2-1 
i-8 
1.4 
1.4 
1.4 
.6 
18*8 cm. 
i -7 
i *9 
2 
2.4 
2-3 
2-5 
29 
2-3 
1 '9 
i *9 
2 
•8 
24*5 cm. 
11. 
Length of intervals. 
Base. 
Tip. 
Total 
lengths. 
Mar. 2, 10.15 a<m * 
1 
I 
1 
1 
1 
1 
•5 
6-5 cm. 
33 3 > S3 
1-9 
1-9 
i -7 
V 9 
i *7 
i-6 
•7 
11.4 cm. 
33 4t 33 
2.1 
3*4 
4-2 
# 
2-6 
2-5 
1. 
19.2 cm. 
33 5? 33 
2.4 
3-8 
4-9 
4.4 
3*7 
3 
1. 1 
23 cm. 
hi. 
Length of intervals. 
Base. Tip. 
Total 
lengths. 
Oct. 4, 9 a.m. 
33 5 3 3 3 
33 6, ,, 
33 73 33 
8 
33 °3 33 
I 
I 
I 
I 
4 cm. 
2-2 
i-6 
1-2 
I<2 
6.2 cm. 
3- 
2-5 
i-7 
1-4 
8*6 cm. 
5. 
4. 1 ^ 
*<r j 60 
2« 
1.8 
12-6 cm. 
6-6 
2.5 
2*3 
16-1 cm. 
IV. 
Length of intervals. 
Base. Tip. 
Total 
lengths. 
Oct. 3, 9.15 a.m. 
33 43 33 
33 5 s 33 
33 63 j, 
33 7 > 33 
I 
1 
1 
1 
1 
I 
I 
7 cm. 
25 
i -7 
2.4 
2 
1-9 
i -3 
1*2 
13 cm. 
3 -i 
2*5 
3-4 
2-6 
2.1 
i-6 
1-6 
16.9 cm. 
3-2 
2-6 
3-7 
2.7 
2-2 
1.8 
1.8 
18 cm. 
3.6 
2-8 
3*8 
31 
2-4 
2-1 
2 
19.8 cm. 
