let's ask bid bad G

http://www.google.com/search?sourceid=chrome&ie=UTF-8&q=%22Vires+in+Numeris

and

http://www.google.com/search?sourceid=chrome&ie=UTF-8&q=%22Vis+in+Numeris

hmm... not clean cut... but Vires in Numeris it is IMO (I wish I had Latin class in High School or Uni).