. The bacteriology of the eye. lo-cocci or cocco-bacillary forms on agarand serum. (b) The growth of many Strepto-cocci on gelatine. (c) The addition of 1 to 3 per cent, of taurocholate of soda (Neufeld) to the mediaprevents the growth of Pneumococcus. but not that of Streptococcus salt can also be dropped into bouillon. Pneumococcus then dissolves after ashort time in the incubator, and the fluid clears. Streptococcus bouillon remainsunchanged. (d) By inoculation in the blood of a white mouse, the Pneumococci are to befound in their typical capsulated forms. (The so-called Strept
. The bacteriology of the eye. lo-cocci or cocco-bacillary forms on agarand serum. (b) The growth of many Strepto-cocci on gelatine. (c) The addition of 1 to 3 per cent, of taurocholate of soda (Neufeld) to the mediaprevents the growth of Pneumococcus. but not that of Streptococcus salt can also be dropped into bouillon. Pneumococcus then dissolves after ashort time in the incubator, and the fluid clears. Streptococcus bouillon remainsunchanged. (d) By inoculation in the blood of a white mouse, the Pneumococci are to befound in their typical capsulated forms. (The so-called Streptococcus mucosus in these tests usually behaves as aPneumococcus.) (Though the Streptococci in other parts of the body are such common pathogenicagents, in the eye they are seldom in question. Their occurrence on the normaland diseased conjunctiva is described on pp. 41, JO). They seldom cause corneal infection. They are relatively rare in simple catarrhalor purulent dacryocystitis;1 they arc more commonly found in the pus of a. Fig. 44.—Drawn from the Secretionin a Frankels Case. The Pnewmococci which form chains in culture arc here excepted. SPECIAL FORMS OF CONJUNCTIVAL INFECTION 209 subcutaneous cellulitis, also in orbital inflammations arising from the adjoiningsinuses. Concerning the finding of Streptococci in the endogenous infections ofthe eye, see p. 36S. Cultures.—A facultative anaerobe. On agar small round grey surface colonies,slightly stippled, transparent. They generally have sharper margins than thecolonies of Pneumococci, and have very little tendency to coalesce. On ascites agar they grow better, and their borders often have fine radialstriatums. In bouillon the growth is variable—sometimes a fine cloudiness, sometimes clear,with a more or less free deposit, which often collects into balls, and can only bebroken up by vigorous shaking. Milk is coagulated after a few days. On potatoes there is at most a scantygrowth—sometimes, indeed, none at all. In a ge
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