What is the difference between a Private Company and Public Company?

What is the  major  difference in  respect of  shares? The difference between a  Private Company and Public  Company is that;

i). The Articles of Private Company restrict  the right  to transfer  its shares;

ii). The Articles Limits the number  of  its members  to  50, and

iii).  The Articles prohibits any invitation to the public to  subscribe for  shares  or  debentures of the  company whereas the  Articles of Public Company do not.  See  section  27(1)(a)-(c)  of Cap.  212