"As we descend deeper and deeper in this region its inhabitants become more and more modified, and fewer and fewer, indicating our approach towards an abyss where life is either extinguished , or exhibits but a few sparks to mark its lingering presence"

In this quote, Edward Forbes is explaining the changes that take place as one journeys deeper into a particular region. He keeps in mind that the residents of this region end up being significantly modified, indicating that they have actually adjusted to their environment in distinct methods. Nevertheless, as they continue to come down, the number of residents reduces, suggesting that they are nearing a point where life is no longer sustainable. Forbes describes this point as an "void" where life either ceases to exist or is hardly holding on. This quote highlights the fragility of life and the impact of ecological conditions on living beings.