and  the  Magnetic  Relations  of  the  Heavenly  Bodies.        487 
tout  ce  qui  vieut  de  vous  est  tres-interessant  pour  moi,  .  .  .  .  je 
vous  prie  de  me  faire  savoir  ou,  et  couiraeut  je  pourrai  me  procurer 
cet  interessant  travail/' 
I  sent  at  once  the  desired  paper  to  Rome.  If,  therefore, 
Father  Secchi  had  undertaken  his  highly  meritorious  observa- 
tions with  the  intention  and  desire  to  confirm  the  law  of  circula- 
tion derived  theoretically  by  me,  he  would  doubtless  have  men- 
tioned my  papers,  which  were  known  to  him,  and  the  necessary 
existence  of  those  currents,  which  I  had  therein  proved. 
It  is  evident  that  through  this  circumstance  the  value  and  im- 
portance to  my  theory  of  the  results  found  by  Secchi  is  essen- 
tially increased,  ami  that  all  u  esprits  ?wn  preuenus"  must  regard 
the  probability  of  that  theory,  and  of  the  causes  from  which  it 
flows,  as  confirmed  by  stringent  facts  of  observation. 
If,  on  the  large  planets  Jupiter  and  Saturn  (as  I  have  rendered 
probable  for  various  reasons*),  the  same  causes  for  the  circu- 
lation of  their  atmospheres  and  liquid  constituents  are  in  exist- 
ence in  consequence  of  the  state  of  high  temperature  on  their 
surface,  the  poles  of  these  currents  will  also  here  not  coincide 
with  the  poles  of  rotation.  It  is  clear  that  then  a  strip  parallel 
to  the  equator  of  currents,  in  the  vicinity  of  its  point  of  inter- 
section with  the  equator  of  rotation,  will,  at  the  end  of  half  a 
revolution,  have  undergone  a  change  of  direction  amounting  to 
double  the  angle  of  inclination  of  the  two  axes.  Hence  exact 
measurements  of  the  angles  of  position  of  the  strips  on  the  large 
planets  would  show  a  period  depending  upon  the  duration  of  a 
rotation,  and  would  therefore  be  appropriate  for  measuring  the 
latter.  Such  researches  will  shortly  be  commenced  in  the  obser- 
vatory of  Chamberlain  von  Bulow  at  Bothkamp. 
It  is  clear  that  then  the  occurrences  in  the  streams  on  the  sur- 
face of  the  large  planets  must  be  connected  by  the  same  tie  with 
the  occurrences  on  the  solar  surface  as  the  inner  glowing  streams 
of  our  planet  are  with  the  period  of  solar  spots.  It  is  to  be  ex- 
pected, therefore,  that  we  shall  find  also  in  the  violent  movements 
and  manifold  changing  forms  of  the  surface  of  Jupiter  a  period 
connected  with  the  frequency  of  sun-spots. 
22. 
If  we  look  at  the  variety  of  relations  which  have  been  deduced 
from  the  theory  here  developed  of  the  physical  causes  of  the 
earth's  magnetism  and  have  been  confirmed  by  observation,  we 
shall  hardly  be  surprised  that  the  influence  of  the  sun-spot 
period  on  the  inner  temperature  of  the  earth  (which  I  have 
explained  theoretically  in  §  15)  has  been  recently  ascertained 
by  observation. 
*  Proceedings  of  the  Royal  Saxon  Society  of  Sciences,  Feb.  11,  18/1. 
