778 DR ALEXANDER BRUCE AND DR JAMES W. DAWSON ON 
be found, possibly of the nature of a malformation. The tissue immediately to the 
mesial side of the facial nerve appears to be unusually vascular, and a cavity—small in 
size and with irregular walls—is developed in relation to the vessels. This cavity 
Fic. G. 
increases in size as it is traced upwards, and involves the fibres of the trapezium. = 
Higher still, it opens out directly on to the surface of the pons and a large irregularly- 
shaped depression results, which does not involve either the facial nucleus or the 
Fic. H. 
descending root of the 5th nerve, but does destroy part of the transverse fibres of the 
pons and trapezium (figs. F., G., H., L). 
Round the vessels, especially the smaller vessels, of the tissue in close relation to this | 
malformation, a granular deposit was found: the dust-like particles were arranged usually 
