METHOD OF ANNUAL EXPERIMENTATION 141 



broken through by bone-cutting forceps and the posterior sections 

 of the vertebral arches removed from the lumbar region to the 

 skull. The dural sheath of the cauda equina is firmly grasped by 

 sterile forceps and the entire cord gradually lifted up as the spinal 

 nerves are successively put on a stretch and divided by sterile 

 scissors. Finally the cervical cord or the medulla is cut across 

 and the cord placed in a sterile glass dish. In addition to the im- 

 mediate examination it is well to place suitable pieces of tissue 

 into fixing flujds for sectioning and histological study, by which the 

 physical relations of the parasites and the tissue elements can 

 be studied as well as the pathological alterations in the latter. 



