Clover nodded at the wisdom of leaving Socrates behind while they ventured upstairs. She then tilted her head towards Meredith at the woman's question--snide remark perched precariously close to the tip of her tongue, before she retracted it at the last moment--and jumped in before Koln could start raving about cars, "Close. Not carbon monoxide, but
sulfur dioxide. Same effect. It can result in respiratory symptoms, difficulty breathing, and even premature death, like our cowled friend here. Volcanoes are a major source of sulfur dioxide. But as I see a lack of lava in the immediate vicinity, and since we do seem to be embroiled in the mansion of a mad doctor of sorts, I would assume the source is a little more scientific and controlled in nature. In the laboratory, sulfur dioxide can be used for bleaching, as a refrigerant, and it can be used to block nerve signals in living organisms." She nodded towards the drawer Koln had just returned from, "Which is why it's best to keep our little friend well away from danger."