Galen on the elements of olfactory sensation.

In different sources for the Galenic doetrine of smell there appear different elements in the nature of the sense of smell. What we shall suggest is that these accounts are as likely to vary because of varying emphasis as because of error in the copying of manuscripts. In the surviving works of Galen (AD 129 ?-I99) mention of the sense of smell and its objeets can be found in four places: (I) De instrumento odoratus,. (2) De usu partium, VIII, 6; (3) De placitis Hippocratis et Platonis, VII, 5-6; (4) Compendium Timaei Platonis, 15 1). Each of these works offers a different