Edit in JSFiddle

// This programatically counts and numbers all the lines in the poem
// by setting the start attribute for each <ol>
$(function () {
    var counter = 1;
    $('.poem ol').each(function () {
        $this = $(this);
        $this.attr('start', counter);
        counter += $(this).find('li').length;
    });
});

<div class="poem">
     <h1>Do Not Go Gentle Into That Good Night</h1>

     <h2>by Dylan Thomas</h2>

    <ol>
        <li>Do not go gentle into that good night,</li>
        <li>Old age should burn and rave at close of day;</li>
        <li>Rage, rage against the dying of the light.</li>
    </ol>
    <ol>
        <li>Though wise men at their end know dark is right,</li>
        <li>Because their words had forked no lightning they</li>
        <li>Do not go gentle into that good night.</li>
    </ol>
    <ol>
        <li>Good men, the last wave by, crying how bright</li>
        <li>Their frail deeds might have danced in a green bay,</li>
        <li>Rage, rage against the dying of the light.</li>
    </ol>
    <ol>
        <li>Wild men who caught and sang the sun in flight,</li>
        <li>And learn, too late, they grieved it on its way,</li>
        <li>Do not go gentle into that good night.</li>
    </ol>
    <ol>
        <li>Grave men, near death, who see with blinding sight</li>
        <li>Blind eyes could blaze like meteors and be gay,</li>
        <li>Rage, rage against the dying of the light.</li>
    </ol>
    <ol>
        <li>And you, my father, there on the sad height,</li>
        <li>Curse, bless, me now with your fierce tears, I pray.</li>
        <li>Do not go gentle into that good night.</li>
        <li>Rage, rage against the dying of the light.</li>
    </ol>
</div>

.poem ol {
    list-style-type:none;
    margin:0 0 10px 30px;
    padding:0;
}
.poem ol li {
    text-indent:-30px;
    padding-left:30px;
    margin:0;
}
.poem ol li:hover {
    list-style-type:decimal;
}
h1 {
    font-size:1.4em;
    font-weight:normal;
    margin:0 0 10px 30px;
}
h2 {
    font-size:1em;
    font-weight:normal;
    margin:0 0 30px 30px;
    font-style:italic;
}