_Retraction of the head and neck._ Retraction of the head and neck, stiffness of the nuchal muscles, and even opisthotonos, may be observed. The existence of these symptoms is always suggestive of meningeal infection, but an abscess of considerable size, even when situated in the anterior part of the lateral lobe of the cerebellum, may so exercise pressure in the downward direction as to cork up that part of the cerebellum which normally extends into the mouth of the foramen magnum. The neighbouring upper cervical nerves may then be irritated or compressed. _Yawning._ Frequent purposeless yawning is said to be pathognomonic of cerebellar disease (see p. 165). _Attitude in bed._ More commonly the patient lies curled up in bed in the position of cerebral irritation, perhaps more frequently with the sound side upwards. (_c_) =Frontal abscess.= The abscess is usually dependent on long-continued suppuration in the frontal sinus, with deficient drainage and spread of disease to the surrounding bone. The abscess may be situated in close relation to the focus of the disease, but, more commonly, it occupies a more posterior position, so much so that direct pressure is exercised on the corona radiata proceeding from the pre-Rolandic or motor area. It would appear also that definite localizing symptoms do not arise until the abscess has attained considerable size. The _general symptoms_ peculiar to all cases of brain abscess are perhaps less definite when the abscess is frontal in position. Thus, although headache may be localized to the frontal region, and although optic neuritis may be present, yet vomiting, alterations in pulse-rate and in respiratory rhythm are less marked than usual. The _localizing symptoms_ are often reasonably definite, so much so that but little difficulty may be experienced in arriving at a diagnosis. In the earlier stages of the abscess formation motor irritation may predominate, with the development of _fits of the Jacksonian type_, the lower and more anterior motor areas being first and mainly affected. More commonly, however, attention will be directed towards the nature of the trouble by _paresis or paralysis of the opposite side of the body_. In this case also the lower motor areas--those responsible for the opposite side of the face and upper extremity (also the motor speech-area on the left side of the brain)--are first and chiefly involved. In some cases--more especially when the abscess is of considerable size--definite hemiplegia may result.