Scientific laws are considered established and universally applicable (to certain class of things or phenomenon under appropriate conditions) but not necessarily definitive. Also called laws of science.
Afflictions of the respiratory system include irritation and infection of the ears, nose and throat. Respiratory problems also may involve congestion, which can be decreased by inhaling rosemary (especially the verbenone type), hyssop (use var. decumbens only), tea tree, eucalyptus, lavender or peppermint.
Two of the best essential oils to eliminate infection are lavender and eucalyptus. In fact, studies prove that a two-percent dilution of eucalyptus oil kills 70 percent of airborne staphylococcus bacteria. Anise, peppermint, and eucalyptus reduce coughing, perhaps by suppressing the brain's cough reflex.