# Work with functions defined inside a Package?

GROUPS:
 I have functions defined inside a Begin Block of a Package in the normal manner (BeginPackage ... foo::usage="bar" ... Begin ... DegreesPerMeterAtmosphere[targelevdeg,startalt]: = targelevdeg+startalt ... etc.)I tried to define variables that would be exposed by the packaged (as below) - but it does not work and I can't find the correct comments ion the manuals. This is the simplified code: BeginPackage[ "FoundationFunctions"] speedlight::usage = "The speed of light in meters/sec"; DegreesPerMeterAtmosphere::usage = "DegreesPerMeterAtmosphere[targelevdeg,startalt] stuff" Begin[ "Private"] speedlight:=299792458 (* m/s *); DegreesPerMeterAtmosphere[targelevdeg_,startalt_]: = targelevdeg+startalt End[] EndPackage[] But when I Get[] the package from a Notebook the function is pulled across but not the variable. Specifically Names["FoundationFunctions*"] yields {"DegreesPerMeterAtmosphere"}.Am I trying to do something that is silly (perhaps one cannot use packages to define/ encapsulate variables)? Or have I done the right thing in the wrong way?
 Writing this let me see what was wrong. This works: BeginPackage[ "Avc" ] ss::usage= "ss zzzzzzzz" abc::usage= "abc yyyyyy" Begin[ "Private" ] ss:=67 abc[x_]:=x+20 End[ ] EndPackage[ ] The extra semi-colons seemed like a good idea (but they were not).
 Confused here because in this Wolfram example (Setting up Wolfram Language Packages) I see no semi-colons ... BeginPackage["Collatz"] Collatz::usage = "Collatz[n] gives a list of the iterates in the 3n+1 problem, starting from n. The conjecture is that this sequence always terminates." Begin["Private"] Collatz[1] := {1} Collatz[n_Integer] := Prepend[Collatz[3 n + 1], n] /; OddQ[n] && n > 0 Collatz[n_Integer] := Prepend[Collatz[n/2], n] /; EvenQ[n] && n > 0 End[ ] EndPackage[ ] Does the example need to be corrected? Could you point me to a link that tells me how to use the semi-colons correctly?Similarly the Wolfram documentation suggests Get as an option during package development (So I have a Notebook that (currently) Get's the package?