1922.] Indian. Science Congress. L$.C. 51 
of the system tc which these belong. The nearest cluster w 
Centauri is deduced to be 6500 parsecs distant, while there are 
clusters at more than ten times this distance. Our present 
state of knowledge with regard to these clusters, seems to indi- 
cate that they are in a way associated with the Galaxy and 
that the bounds of the Milky Way system are probably more 
extensive than were supposed some time ago, 
Before concluding, I wish to take the opportunity of re- 
marking how important are the theoretical investigations in 
the solution of these great problems of sidereal astronomy. 
persistent attempt at the interpretation of the facts gathered 
forms one of the greatest necessities for the progress of a 
Science. Schwarzchild’s elegant methods developed in his 
vestigations on the basis of the well-known laws of gravita- 
tio 
to the kinetic theory of gases. The theory of star-streams, 
the equilibrium of the galactic system, the dynamics of 
globular clusters, have all received attention during recent 
ears. Developments in mathematical analysis and dis- 
towards progress in these theoretical investigations. As 
Schwarzchild has once expressed it “ athematics, Physics, 
Chemistry, Astronomy march in one front; whichever lags 
behind is drawn after. Whichever hastens ahead helps on the 
others. The closest solidarity exists between astronomy and 
ittingly by my teacher 
Seeliger and afterwards was further nou i : 
y d Astronomy constitute 
Greek culture, is only to be com- 
is bri ‘+ has been my endeavour to place 
n this brief address, 1 x a ot 
the stellar system have been recentl é 
ledge. By the gradual ace mulation of observations, — 
over long periods, a new field of enquiry has been proug 
