290 
Trariffacfionx of the Bmjal Society of Soufh A frica. 
In Table 1, column 1 shows the hour of the lunar day. 
Column 2 the pressure variations at peiigee when the moon's upper 
meridian passage (= U.M.P.) occurs within two hours of noon. 
Column 3 the same for near midnight. 
Column 4 the same when U.M.P. falls between TI and X, and between 
XIV and XX (" Horizon "). 
Column 5 the mean of columns 2, 3, 4. 
Column 6 the pressure variations at apogee. 
C'Olumn 7 the mean of columns 5 and 6. 
Column 8 is added to show the velocity deviations for perigee and apogee 
together. The quantities are taken from the second and third papers. 
Table I. — llean Hourly Air-Tidal Variation. 
Perigee P. 
Apogee A. 
Winrl. 
Hour. 
P + A 
P + A 
Noon. 
[.Midnight. 
Horizon. 
Mean. 
Mean . 
2 
Inch. 
Inch. 
Inch. 
Inch. 
Inch. 
Inch. 
Mile. 
L.M.P. 
•9958 
10055 
1 0107 
1-0043 
•9952 
-9997 
10 039 
II 
•9966 
1-0057 
10106 
1-0045 
-9947 
•9996 
10070 
III 
•9961 
1-0052 
1-0096 
1-0038 
-9936 
•9987 
10 058 
IV 
•9955 
1 -0043 
10092 
10032 
-9932 
■9980 
10-001 
V 
•9950 
1-0033 
1-0078 
1-0022 
-9924 
•9973 
9-932 
VI 
•9953 
1-O042 
1-0075 
1-0026 
-9924 
-9975 
9-884 
VII 
■9957 
1-0039 
1-0083 
1-0029 
-9922 
-9976 
9-894 
VIII 
•9953 
1^0037 
1-0082 
1^0026 
9918 
•9972 
9-927 
IX 
•9982 
1^0040 
10075 
1 0034 
-9921 
-9977 
9-949 
X 
•9987 
1^0046 
10075 
10037 
•9935 
-9986 
9939 
XI 
•9998 
1-0061 
f0078 
1-0048 
-9939 
•d994 
9-924 
XII 
1-0013 
10052 
1^0078 
1 0049 
-9946 
-9997 
9-910 
U.M.P. 
10023 
1-0042 
10066 
1-0044 
-9953 
-9999 
9-904 
XIV 
1-0 '22 
10036 
f0063 
1-0041 
-9954 
-9997 
9-920 
XV 
1^0017 
10027 
1-0041 
1-0028 
•9943 
-9985 
9933 
XVI 
10015 
1 0017 
1-0030 
1-0020 
•9936 
-9978 
9-940 
XVII 
1-0008 
1-0011 
1-0022 
1-0013 
■9933 
•9973 
9-932 
XVIII 
•9994 
1-0000 
1-0028 
1 0007 
-9934 
•9970 
9914 
XIX 
-9988 
100J2 
1-0017 
1-0003 
•9935 
•9969 
9^908 
XX 
1-0018 
-9995 
10013 
10008 
•9936 
•9972 
9^904 
XXI 
1^0015 
-9996 
1-0008 
1-01)06 
-9943 
•9975 
9917 
XXII 
1-0019 
1-0005 
1-000 1 
I 0008 
•9944 
-9976 
9^932 
XXIII 
10050 
1-0018 
-9995 
1 0020 
-9954 
-9987 
9-954 
XXIV 
1-0054 
1-0011 
-9988 
10016 
-9958 
■9987 
9-968 
L.iAT.P. 
1^0070 
]-0013 
-9975 
1-0018 
-9960 
•9989 
10^007 
Average . 
-9997 
1-0029 
1-0051 
. 
1-0026 
-9939 
-9983 
9^946 
No. of \ 
days J 
121 
143 
131 
395 
399 
794 
1758 
