In reviewing the literature for 1927 on the subjects of acute and chronic otitis media purulenta and sinus thrombosis, I have selected only those papers which promote discussion. Many papers appeared which are not reviewed in these pages; but either they were of the type which reiterates well established facts or they reported cases interesting enough in themselves but not of unusual import.
ANATOMY, PATHOLOGY AND BACTERIOLOGY
In determining the effect of pneumatization of the mastoid process on the progress of an otitic infection, Wonsowski1 arrived at the following conclusions from a study of sixty cases: He found that in a well pneumatized mastoid process a greater amount of intramastoidal destruction is presented at operation; but, on the other hand, a minimum number of complications occur when a mastoid process of this type is infected. In the diploic type of mastoid process, there is a tendency to diffusion