Ruby – How to select option in drop down using Capybara

I'm trying to select an item from a drop down menu using Capybara (2.1.0).

I want to select by number (meaning select the second, third, etc option).

I've Googled like crazy trying all sorts of things but no luck.

I was able to select it by using the value:

 find("option[value='4c430d62-f1ba-474f-8e8a-4452c55ea0a8']").click

But I don't want to use that method b/c the value is something that will change and that will make my test brittle.

The HTML for the drop down is:

<td class="value">
    <select name="organizationSelect" id="organizationSelect" class="required">
     <option value="NULL">Choose...</option>
     <option value="4c430d62-f1ba-474f-8e8a-4452c55ea0a8">&nbsp;Institution1</option>
     <option value="e1a4efa7-352d-410a-957e-35c8a3b92944">&nbsp;Institution / test</option>
    </select>
</td>

I also tried this:

  option = find(:xpath, "//*[@id='organizationSelect']/option[2]").text  
  select(option, :from => organizationSelect)

But it results in this error:

Ambiguous match, found 2 elements matching option "Institution" (Capybara::Ambiguous)

So how can I select the first, second, third, etc option from the drop down (using Capybara) ?