Tumors within the spinal canal may occur in so many locations, not only regarding the segments of the cord but as to the relationship to the circumference of the cord, both intramedullary and extramedullary, that one does not have to draw on one's imagination to realize that the symptoms produced are so variable that it is only in the reporting of group cases that it will be possible to make progress in the diagnosis of this condition. It is my opinion that a great many patients come to orthopedic surgeons complaining of local and referred pain in the region of the spine who have no bone lesion but a lesion of the cord, and are seen by this group of surgeons much earlier than by the neurologist or neurosurgeon. I have selected four cases of spinal cord tumors that have come under my observation, all having shown symptoms that suggested