The conjunctiva consists of three parts (1) the conjunctiva tarsi, the part on the lids; (2) the conjunctiva bulbi, the part on the eyeball, and (3) the conjunctiva fornicis, the part connecting the first and second; it is the retrotarsal fold or the region of transition, often called the fornix. The first part can be seen by everting the lids. It is adherent to the tarsus. It is covered with a laminated cylindrical epithelium. The membrane contains an abundance of lymphocytes similar to adenoid tissue. This increases with every inflammation of the conjunctiva. This is why =chronic conjunctivitis= often results in thickened lids. The =blood supply= of the conjunctiva of the lids is from the muscular branches of the ophthalmic artery. The =nerve supply= is from the ophthalmic division of the 5th cranial and the sympathetic. The bulbar conjunctiva continues over the cornea. It is covered with layers of pavement epithelium. Its blood supply comes from the posterior conjunctival vessels about the retrotarsal fold, and the anterior ciliary arteries which accompany the tendons of recti muscles; these two systems anastomose in the conjunctiva. Conjunctival injection or congestion shows a superficial net work of larger or smaller vessels that move with the conjunctiva. The color is scarlet or brick red. Ciliary injection occurs as a rose-red or pale violet zone around the cornea, spoken of as peri-or circumcorneal injection. It does not move with the conjunctiva and occurs more with diseases of the cornea, iris and ciliary body. In the =etiology of conjunctivitis= a great variety of germs are considered by different writers. Collins and Mayo give a report of “germs found in normal conjunctiva.” Bacillus Xerosis in 94% of normal conjunctivæ; Staphylococcus Albus in 79%; Pneumococcus in 9%; Diplobacillus in 6%; Staphylococcus Aureus in 6%; Streptococcus in 5%. If this be true, and I do not doubt their statement, we are practically compelled to say that these germs at least are only secondary in the etiology of conjunctivitis. Just at this point osteopathy comes with its flood of light and makes it easily explainable why some conjunctivæ become inflamed while others do not, when all have germs present. The lesion disturbing the integrity of blood supply and nerve force to the eye is the primary cause while the presence of germs may be the aggravating cause. The lesion prepares the soil in which the germs thrive sufficiently to become an irritant. There are all gradations of this soil preparation. The more fertile the field (i. e. the more profound the effect of the lesion) the more virulent germ life may become; the resistance is proportionately less. =Conjunctivitis= is =classified= for convenience in study, diagnosis and treatment as follows: