KEACTION OF PLANETS UPOlsr SUN PUISEUX. 



173*% 



The plots were very irregular. Generally there was no similarity 

 in their contour, even for the same planet, between the two hemi- 

 spheres; neither was there between the same homispheres for differ- 

 ent planets. There is one single coincidence, perhaps, which seems 

 not due to chance. There is a maximum of ephemeral spots noted 

 in the zones the meridians of which either Jupiter or Venus had 

 already passed three hours previously. 



It is notable that for this interval of 36 years a terrestrial ob- 

 server always notes in the central region of the sun more disap- 

 pearances than appearances. The difference reaches 10 parts per 

 100. This agrees with what Mrs. Maunder found for the interval 

 1889 to 1901. For Jupiter and Venus the births seem more frequent 

 when the planet is above than when under the horizon; that is, in 

 the opposite sense from what Mrs. Maunder found for the earth. 

 But the difference is very small and merits no physical explanation. 



The relation between the east and west hemispheres of the sun, as 

 seen from a planet, is for Venus in the opposite sense than is the 

 case for the earth. In the case of Jupiter there is scarcely any dif- 

 ference, as the following table shows: 



Another comparison may throw some light on the matter. When 

 a planet is on a given side of the equator is the hemisphere on the 

 same side as the planet especially favored with spots? The reply 

 is contained in the following table : 



This table seems significant if only tlie left half is considered. 

 But the preponderance in the southern hemisphere continues whether 

 the planet is to the south or to the north. That is, in the interval con- 

 sidered, the southern hemisphere of the sun had habitually more 

 spots. This may be due to causes within the sun and to no influences 

 from the planets. 



