OCEAN AND ATMOSPHERE. 23 



nection between the recurrence of atmospheric distur- 

 bances and the recurrence of similar positions of the 

 moon is, however, maintained by Lieutenant Saxby, 

 R.N. in his 'Weather System;' in which he states 

 that from long continued observation he was led to 

 combine lunar changes and actual weather distur- 

 bances into the relationship of cause and effect. We 

 are, however, verging upon matters of detail, with 

 which, though deeply interesting in themselves, we 

 are not at present concerned. 



181. We have seen that the effect of the solar 

 tides upon the annual tide will be similar each year; 

 but that the effect of the lunar tides will, in con- 

 sequence of the gradual changing from year to year 

 of the periods at which the extremes of lunar declina- 

 tion occur, sometimes retard and at other times 

 hasten the period at which the annual tide turns. 

 And that it will also, in cycles of 149 years, cause 

 the rise of the annual tide to be higher during one 

 part of that cycle of years than during another part of 

 it: for eight times during that cycle of years the 

 moon's oscillations in latitude are increasing in each 

 successive revolution round the earth; and eight 

 times, at intermediate periods, they are decreasing. 

 During the years 1856, 1857, and 1858 each oscilla- 

 tion extended about 28 from the equator on each 

 side; whereas, during the years 1865, 1866, 1867, 

 and 1868 they extend only about 19 from the 

 equator on each side. These oscillations at times 



