SOCIETY OF THE UNIVERSITY OP ABERDEEN. 123 



and laterally by a new growth extending throughout the whole length 

 of the canal and situated between the dura mater and the pia mater 

 and attached to the latter. This growth when traced upwards seems 

 to surround and lose itself indefinitely in the medulla oblongata. 

 Microscopically it has the structure of gliomatous tissue. 



Whether this morbid condition is in any way associated with an 

 attempt at the formation of a second spinal cord an attempt which 

 has aborted and passed into pathological formation is a question 

 which presents itself for consideration. Two cases of localised doub- 

 ling of the spinal cord have been recorded by Dr. Alexander Bruce in 

 vols. iii. and iv. of the Review of Neurology and Psychiatry, and along 

 with this record Dr. Bruce gives a complete synopsis of thirty-six 

 cases which had been collected by Steiner. The present case presents 

 much similarity with examples of diffuse sarcoma of the spinal pia 

 mater described by Dr. Sidney Coupland and Dr. William Pasteur in 

 vol. xxxviii. of the Transactions of the Pathological Society of London. 



EECORD OF ANATOMICAL VAEIATIONS. 



Date of observation, 1905-1906. 



Variations in the roots of the lungs. 



Fifteen subjects were examined, and of these five were found to 

 be normal on both sides (33 per cent.), two abnormal on both sides 

 (13 per cent.), seven abnormal on the left side alone (47 per cent.), and 

 one abnormal on the right side alone (7 per cent.). 



Thus 60 per cent, were abnormal on the left side, and 20 per 

 cent, on the right side. 



Left side 



Above downwards. 



6 in normal position A B V 



4 with A in front of B A B V 



3 with B above A - B '. V 



2 with V highest and A lowest V B A 



Antero-posterior. 

 V A B 

 A V B 

 V A B 

 V A B 



