_Trigeminal Nerve_: This is the great sensor nerve of the face and carries a motor division, the inferior maxillary, to some of the muscles of mastication, as the temporal, masseter, and buccinator. It has connected with it four ganglia, which also receive sympathetic roots, and the ganglion of origin of its sensor axons, the Gasserian or semilunar, also receives direct sympathetic communications. The importance of this communication is shown by the powerful effect of adjustment of third or fourth Cervical for tic dolouroux. _Ear_: The external ear receives branches from the vagus and from the first and second cervical nerves. The middle ear and Eustachian tube are supplied by the tympanic plexus made up of branches from the glosso-pharyngeal, otic ganglion, facial nerve and the small deep petrosal from the sympathetic on the carotid artery. By all these routes communication from the third and fourth cervicals is possible but especially is the latter important. The fourth cervical is the especially frequent subluxation with middle ear disease. To the internal ear and auditory or acoustic nerve there appears to be no direct route from the spine. It has not yet been conclusively established within the writer’s knowledge that adjustments will affect auditory deafness but Meniere’s Disease, inflammation of the semicircular canals, has been cured repeatedly by adjustments of Atlas or Axis, by what route I am unable to state. _Teeth and Gums_: It is probable that the only connection between the vertebrae and the teeth is an afferent one by way of the trigeminal. Toothache may be stopped by adjustment of C 3, or C 4, but no evidence is at hand to show that the condition of the teeth is improved or that more than a temporary effect can be had. Trophic changes in the gums may be due to vascular disturbances controlled by the sympathetic. _Tongue_: The hypoglossal, motor nerve to both the intrinsic and extrinsic muscles of the tongue, receives direct axons from the loop between the first and second Cervical nerves. Sympathetic fibres pass to the blood-vessels and secreting glands of the tongue. _Tonsils_: Receive fibres from the spheno-palatine ganglion and by this means are brought under the domination of C 2, 3, and 4. Abundant clinical evidence in tonsilitis, simple, follicular, and suppurative, proves this to be the practically, as well as anatomically, correct nerve connection. _Salivary Glands_: The parotid receives branches from the great auricular nerve from the second and third cervical, and from the sympathetic on the external carotid artery, branches from the superior cervical ganglion. The submaxillary and sublingual glands are connected with the submaxillary ganglion, which receives a sympathetic root and which, with the chorda tympani also carrying fibres derived from the sympathetic, controls the secretions of these glands.