(Cowan, 1969), tonsils (Hellgren, 1971; Iqbal, 1971), and skin (Barr and Danielsson, 1971). The standard method used to identify neisseria is the fermentation reactions when tested against glucose, maltose, and sucrose. A disadvantage of the serum agar slopes of these sugars is that many laboratories find difficulty in interpreting the results owing to the occurrence of a non-specific change in the indicator which sometimes develops and often makes the interpretation of the maltose results impossible and, moreover, leads to a complete lack of confidence in the test. The identification of a suspected pathogen is always desirable but this will not be achieved when gonococci are isolated from sites where other neisseria are likely to be found, unless the fermentation tests employed are absolutely reliable.