Rails - Dec 2013 - Rails Engines problem: routing_error.erb within rescues/layout

I'm working through the Rails Engines tutorial at 
http://edgeguides.rubyonrails.org/engines.html.  I'm using ruby 1.9.3 and 
rails 3.1.12 on Linux.  I'm stuck on section 4.1.  When I try to access 
localhost:3000/blog I get:

Started GET "/blog" for 127.0.0.1 at 2013-12-26 15:25:12 -0500

ActionController::RoutingError (No route matches [GET] "/blog"):  

Rendered 
/home/XXX/.rvm/gems/ruby-1.9.3-p484/gems/actionpack-3.1.12/lib/action_dispatch/middleware/templates/rescues/routing_error.erb
within rescues/layout (47.4ms)

But, It looks like that should be a valid route:

$ rake routes
blorgh  /blog {:to=>Blorgh::Engine}

The engine is included in the bundle:

$ bundle show
Gems included by the bundle:
  * actionmailer (3.1.12)
  * actionpack (3.1.12)
  * activemodel (3.1.12)
  * activerecord (3.1.12)
  * activeresource (3.1.12)
  * activesupport (3.1.12)
  * ansi (1.4.3)
  * arel (2.2.3)
  * blorgh (0.0.1)
  * builder (3.0.4)
  * bundler (1.3.5)
  * coffee-rails (3.1.1)
  * coffee-script (2.2.0)
  * coffee-script-source (1.6.3)
  * erubis (2.7.0)
  * execjs (2.0.2)
  * hike (1.2.3)
  * i18n (0.6.9)
  * jquery-rails (3.0.4)
  * json (1.8.1)
  * libv8 (3.16.14.3)
  * mail (2.4.4)
  * mime-types (1.25.1)
  * multi_json (1.8.2)
  * polyglot (0.3.3)
  * rack (1.3.10)
  * rack-cache (1.2)
  * rack-mount (0.8.3)
  * rack-ssl (1.3.3)
  * rack-test (0.6.2)
  * rails (3.1.12)
  * railties (3.1.12)
  * rake (10.1.1)
  * rdoc (3.12.2)
  * ref (1.0.5)
  * sass (3.2.13)
  * sass-rails (3.1.7)
  * sprockets (2.0.4)
  * sqlite3 (1.3.8)
  * therubyracer (0.12.0)
  * thor (0.14.6)
  * tilt (1.3.7)
  * treetop (1.4.15)
  * turn (0.8.3)
  * tzinfo (0.3.38)
  * uglifier (2.4.0)

Where should I look for the error?

Thanks.

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