OPHTHALMIA — OSTITIS. 97 



latter is an aperture in the centre of the iris (Fig. 15), and is eapahle of 

 contraction and expansion ; hence in a strong light the pupil becomes 

 smaller; and in a dim light, or in the dark the pupillary opening is 

 large. The iris, which also gives the colour to the eye, as before 



Fig. 14. Section of Eyeball, show- Fig. 15. Iris, showing, 1, Pupil- 



A, Cornea ; B, Lens ; c, Iris ; D, An- lary Opening ; 2, Attached 



terior Chamber and Aqueous Humour ; Border. 



E, Sclerotic Coat ; F, Choroid Coat ; G, 

 Retina ; H, Vitreous Humour. 



mentioned is sometimes the seat of disease, and the pupillary 

 opening loses its power of movement. 



A little of the following ointment may also be introduced into 

 the eye, night and morning. Yellow oxide of mercury, Igi-. ; lard or 

 vaseline, Idr. Or the eye may be touched night and morning with 

 a camel-hair brush which has been dipped into nitrate of silver, 2gr. ; 

 distilled water, ^oz. 



If the disease be thought to be sympathetic with derangement of 

 the digestive organs, change the diet, and in any case give light and 

 nutritious food. When the eye is veiy sensitive to light, the dog 

 should be kept in a shaded kennel and not exercised in the glare of 

 the sun ; but exercise is absolutely necessary to general health, 

 especially in weakly dogs ; and so is light, so that the place where 

 the patient is kept, whilst shaded, must not be absolutely dark. 

 The kennel must be perfectly clean, and if disinfectants are needed, 

 avoid chloride of lime or carbolic acid, as they might increase the 

 inflammation. Condy's Fluid would be most suitable under the 

 circumstances. 



OSTITIS (Inflammation of the Bone).— This disease may 

 be due to direct violence, blows, etc., or to constitutional disturbance, 

 such as rheumatism or scrofula. The symptoms are pain, heat and 

 swelling of the skin at the affected part, and lameness. Best is 

 most essential in treating these cases, and should be combined with 



