For each `.furcLeft` I want to have its unique index, starting from number 1.
With the provided code the first `.furcLeft` has number 1, but the second `.furcLeft` has number 3, and the next `.furcLeft` restarts from 1. This is not supposed to happen, the index should continue but not restart.

```js
$(".furkation .bottom-addFurcation .furcLeft").each(function() {
   $(this).html(($(this).index()+1));
});
```

```html
<tr class="furkation">
  <td class="bottom-addFurcation">
     <div class="furcLeft"> <!-- Number 1 should appear here -->
        <div class="insert_furcation"></div>
     </div>

     <div class="divider"></div>

     <div class="furcLeft"> <!-- 2 -->
        <div class="insert_furcation"></div>
     </div>
  </td>

  <td class="bottom-addFurcation">
     <div class="furcLeft"> <!-- 3 -->
        <div class="insert_furcation"></div>
     </div>

     <div class="divider"></div>

     <div class="furcLeft"> <!-- 4 -->
        <div class="insert_furcation"></div>
     </div>
  </td>
<tr>

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
```