There are no snakes, frogs, nor poisonous spiders because the soil repels them given that this is where Lacerie Island [Cléire/Clear Island] is located.
What draws my attention here is that the soil is stated to repel snakes, frogs, and poisonous spiders. It also seems that this is because the soil is of a place called Clear Island. What is it about this soil that would repel such creatures?
This is why the pagans from the Indies believe that their souls go to these islands when they die where they live in eternity off the scent of those fruits; they believe it to be their paradise, but the truth is that is a fable.
I found it interesting that the pagan idea of paradise was specifically dismissed as fable, considering the idea of paradise after death is shared by many religions, including Christianity. As far as I can tell, the only difference here is that these islands are firmly on earth, while heaven is considered beyond Earth.