6) J 
Chase. } : 526 [July 19, 
to strengthen the inferences which 1 have already published, and, per- 
haps, supply additional data of a novel character. 
The accompanying tables and curves are constructed on the same plan 
as those in my previous meteorological papers. The scale and the degree 
of smoothing by successive means are uniform ; the comparative influ- 
ence of the sun, moon and Jupiter can, therefore, be readily seen ata 
glance. The vertical lines (0 to 7) in each set of diagrams indicate the 
mean hour at which the moon or planet is on the meridian, as follows : 
0 12M: aor, Mi. 4 12P.M. 6 6A. M. 
to Py ve. 3° 9P. M. be ok Me Ur ALM. 
The tidal influence, therefore, co-operates with the maximum direct 
solar influence, in the atmosphere as a whole, and especially in the 
upper currents, at 0 and 4; in the lower atmosphere and with the surface 
winds, at 2 and 6. The positions of Newton’s theoretical high tides 
(Principia, B.1., Prop. 66, Cor. 20) are at Land 5 ; the low tides at 3 and 7. 
My theoretical low barometer is synchronous with Newton’s high tide ; 
high barometer, with low tide. 
The moon’s influence is most marked in the heavy rains (a) ; least, in 
the frequency of rainfall (y). The principal maximum both in frequency 
and amount, is near the time of full moon, when the local atmospheric 
TABLE Ivy. 
Number of Rainfalls,and amounts of heavy rains (one inch or more), at San Francisco, 
on Lunar days. 
NUMBER OF RAINFALLS. | AMOUNT OF HEAVY RAINS. 
cK hae eno! @ 
1857-64. 1864-72, Av. 1849-57. 1857-64. 1864-72. Av. 
| AEN TEER (oa pete ee 
No. N.: No N,N, Ay NG HAR CIN oat ING SING 
16 108 4 91 89|| 3.26 118 1.73 84 «2.38 TS 92 
IT? 102. 36 96 91|) 289 104 4.10 95 00 66 87 
12 oT) 620 107 97 || 2.20 79 00 66 4.21 81 17 
15 99 21 . 109 101]; 1.04 61 00 6h 161 92 74 
17-208 it 0% = 101) 39 64 3.69 4114 212 111 97 
Tat 106: <b 99 100}) 2.08 73 3.29 144 6.29 124 116 
UW7s 11. oe 106. 104)):4.04 208 «2.67, 148.114... 118. dy 
19, 116 22 Ji@ L07)1.00. 0d 2 142. 38.22 100 1G 
16 115 18 109 106/| 287 1138 350 141 3849 106 118 
18 110 20 98 99 || 4.88 120 246 122 2.75 91 110 
Zoe 108) ul 87 93 || 2.45 103 2.28 87 «1.45 79 90 
18/7102 16 85 95 || 1.85 17 00 64 1.05 116 88 
18.- 130 “15 93 106 )| 1.21 78 1.80 SU £70) 18h UG 
17° «121 «19 «©6105 «6118 |) 2.46 128 2.60 128 6.09 207 154 
91, 126 20. M17 12h ao, to. 1s 166 00. 190 176 
00 116 26 (117 =~ 319 1 609° 2 baa 80 Ob Boa" © 166 
ale 98 16 104 107/| 2.30 126 246 152 00 218 . 181 
4 89 «14 98 102 00° 180° 2g 100, 4b iE ay 
13 87 «21 101 .,105)|,.980 169. 1.07 68 454 103 112 
138 87 18 100 104|| 2.27 129 00 60 -00 68 87 
13 86 14 95 97 00 83 2.99 86 «1.60 49 12 
13 87 «18 97 92 || 3.63 78 71:00. HT 162 55 80 
13 89 «619 98 92 || 2.20 12 OG 12h: 8d 66 83 
14 89 15 93 94. 00 59 00 98 3.08 66 72 
14 81 15 90 93 || 2.54 67 = =2.02 90 1.02 48 67 
8 ta NG 93 89 |) 2.38 15 2.79 93 00 31 63 
10 78). 046 98 89 || 1.42 69 1.49 70 1.68 44 60. 
16 95 19. 1038 94 || 1.38 73 00 41 00 94 72 
1% 108.19 108 97 || 2.80 96 1,25 32 8.46 138 94. 
oe a 96 94) 341 116 OO 48 1.67 119 98 
