June 19, 1874.] J-*^^ [Chase. 



JUPITER- CYCLICAL RAINFALL. 



By Pliny Earle Chase, Professor of Physics in Haverfoud 



College. 



{Read before the American Philosophical Society, June I'dth, 1874.) 



The records of daily rainfall for twenty-seven years, at "Husband's " 

 Station, Barbadoes, for which I am indebted to the courtesy of His 

 Excellency Governor Rawson W. Rawson, C. B., have enabled me to 

 extend my cyclical researches, and to discover some new and interesting 

 features in the cosmical disturbances of local meteorology. 



Although my previous investigations have convinced me that each of 

 the planets exerts, on our atmospheric currents, an appreciable influence, 

 which might be usefully formulated for any given station, provided the 

 observations were enough extended, I have thought it best to confine 

 myself mostly to the study of such weather modifications as are depen- 

 dent upon Jupiter and the moon. 



Those who are accustomed to think of simple tidal disturbances as the 

 only ones to which we can reasonably look for planetary influence, and 

 even those who are also willing to attach some importance to the modifi- 

 cation of atmospheric elasticity by direct attraction, are doubtless pre- 

 pared to believe, on sufficient evidence, that the moon may affect our 

 winds and storms to a slight degree, while they are extremely skeptical, 



TABLE I. 



Normal Percentages of Rainfall at Barbadoes in Jovian Synodic Years. 



1847-55. 1855-63. 1863-72. 1847-68. 1859-72. 1847-72. 



1 124 



2 110 



3 102 



4 98 



5 102 



6 107 



7 106 



8 95 



9 75 



10 62 



11 67 



12. 77 



13 86 



14 99 



16 100 



16 99 



17 92 



18 83 



19 74 



20 68 



21 68 



22 82 



23 109 



24 135 



25 141 



26 128 



27 114 



28 122 



29 142 



30 142 



A, P. S. — VOL. XIT. Y 



