We are going to create set an application to manage a set of 
organic molecules.
Issue the command line:

C:\ruby> rails organics

1. Crating organics Rails Application:

This command creates automatically the related organics 
directory:

subdirectory of C:\ruby>, as it did "demo" directory creation. At 
this point, "organics application" is an empty Rails application.

Run the "organics" server under this command line:

C:\ruby\organics\> ruby script/server

That will start your WEBrick web server. 
Check at :http://localhost:3000/;
especially the line: Application root	C:/ruby/organics.

2. Notations:

project name: Organic

model: Hydrocarbon
controller: Hydrocarbon
class: Hydrocarbon

database table: hydrocarbons
object: row -> its properties: columns (as compound)

Object @hydrocarbon = Hydrocarbon.find(params[:id])
Set of Objects = array : @hydrocarbons = Hydrocarbon.find(:all)

@hydrocarbon.compound - extracts the object's value of compound 

http://localhost:3000/hydrocarbon/list/x
hydrocarbon:project name
list: method
x: parameter (id)