iris may be affected at the first and second dorsals. This point is also taken advantage of by the osteopath, for lesions of these fibres occur oftentimes at the upper dorsal. It is claimed that important fibres that aid in the control of the metabolism of the retina, may be affected at the fourth and fifth dorsals. =Lungs.=—Reflex constriction by stimulation of the intercostals, central end of the sciatic, abdominal pneumogastric and abdominal sympathetic. There is not a rich vasomotor supply.[38] The essential feature to the osteopath is that the vaso-constrictors to the lungs and bronchial tubes are very likely to be interfered with by rib and vertebral dislocations, from the second to the seventh dorsals, inclusive, but chiefly at the third, fourth and fifth. The heaviest innervation being from the third, fourth and fifth spaces, probably explains why asthma is often due to a dislocation of the third, fourth or fifth rib. =Heart.=—First to fifth thoracic via ganglion stellatum and inferior cervical ganglion. Vasomotor fibres to the coronary arteries are found in the vagi. =Intestines.=—Sympathetic, chiefly through the splanchnic nerves. Vaso-constrictors of the jejunum from the fifth dorsal down, for the ileum slightly lower and for the colon still lower. There are none below the second lumbar. Dilators are present in the same sheath, but more abundant in the last three dorsals and the upper two lumbars; all probably end in the solar and renal plexuses. =Receptaculum Chyli.=—Stimulation of the splanclinics causes dilatation. =Liver.=—The splanchnics chiefly on the right side. The vagus contains vaso-dilators. There are also fibres from the inferior cervical ganglia of the sympathetic. =Kidneys.=—Vasomotor nerves from the sixth dorsal to the second lumbar, but principally from the ninth to twelfth dorsals, inclusive. In the large majority of kidney diseases, lesions are found from the tenth to the twelfth dorsals. Stimulation of the sciatic centers causes contraction. There are also fibres from the superior cervical ganglion. =Spleen.=—Vasomotor fibres are in the splanchnics, third dorsal to third lumbar, principally, on the left side. There are some fibres direct from the brain. Stimulation of the vagi contracts the spleen. =Portal System.=—Fifth to ninth dorsal. =Generative Organs.=—For Fallopian tubes, uterus, vagina, vas deferens and seminal vesicles, vasomotor fibres are found in the lower dorsal, and the second, third, fourth and fifth lumbar nerves, principally. =Coccyx and Immediate Region.=—Third lumbar down. =Back Muscles.=—Dorsal Posterior branches of the lumbar nerves and intercostal nerves. These nerves arise from the gray ramus of the corresponding sympathetic ganglia. =Arm.=—From the brachial plexus, the sympathetic, inferior cervical ganglion and first thoracic ganglion, and sometimes lower. =Leg.=—Second dorsal down, the sciatic and crural nerves, and the abdominal sympathetics. Sensory Nerves