By the foregoing Accounts we may observe, that _Mankind_, _Quadrupedes_ and _Plants_ seem to be infected in the same manner, by unwholesome _Insects_; only allowing this Difference, that the same _Insect_ which is poisonous to Man, is not so to other Animals or Plants, and so on the contrary; we observe likewise, that Pepper which is of Use to Mankind, is poisonous to other Creatures, and tho' a Man cannot eat of the _Cicuta_, or _Hemlock_, without prejudice, yet a _Cow_ and some other Animals will eat it to their Advantage; and the _Manchanese_ Apple, which is deadly Poison to almost every Creature, is eaten greedily by Goats, and which is strange, the Milk of those Goats is wholesome to Mankind. Again, we may remark that _Camphire_ which may be taken at the Mouth by the Human Race, and is helpful in many Cases, will destroy _Insects_; for among the Curious who have Cabinets of Rarities, it is a common Practice to lay it in their Drawers and Cases, to destroy the smaller kind of _Insects_, which would otherwise devour their Collections. The Smoaking of Tobacco is helpful to some Constitutions, but was the pure Leaf to be taken directly into the Stomach, it would Purge in a violent Manner, and the Oil of it as I am told is a deadly Poison; however it is to be remarked, that in the time of the last Plague in _London_, _Anno_ 1665, that Distemper did not reach those who smoak'd Tobacco every Day, but particularly it was judged the best to smoak in a Morning. We have an Account of a famous Physician, who in the Pestilential time took every Morning a Cordial to guard his Stomach, and after that a Pipe or two before he went to visit his Patients; at the same time we are told, he had an Issue in his Arm, by which, when it begun to smart, he knew he had received some Infection, (as he says) and then had recourse to his Cordial and his Pipe, by this means only he preserved himself, as several others did at that time by the same Method. I suppose therefore, that the Smoak of Tobacco is noxious to these Venomous _Insects_, which I believe to be the Cause of the Plague, either by mixing it self with the Air and there destroying them, or else by provoking the Stomach to discharge it self of those Morbid Juices which would nourish and encourage them.