The Dental cosmos . filled with the antiseptic to be tested, andcovered with plates of decalcified ivory of equal thickness. Upon theseplates are laid a number of small pieces of decalcified ivory or den-tine. As soon as the antiseptic passes through the plate of ivory insufficient quantity to act upon the small piece of dentine, the latteritself acquires an antiseptic action and consequently inhibits thegrowth of bacteria in its neighborhood when it is placed on a plate ofgelatine or agar-agar (Fig. 2). We accordingly take the small piecesof ivory from each vessel, one at a time, at intervals
The Dental cosmos . filled with the antiseptic to be tested, andcovered with plates of decalcified ivory of equal thickness. Upon theseplates are laid a number of small pieces of decalcified ivory or den-tine. As soon as the antiseptic passes through the plate of ivory insufficient quantity to act upon the small piece of dentine, the latteritself acquires an antiseptic action and consequently inhibits thegrowth of bacteria in its neighborhood when it is placed on a plate ofgelatine or agar-agar (Fig. 2). We accordingly take the small piecesof ivory from each vessel, one at a time, at intervals of about tenminutes, and put them upon a plate of infected gelatine or antiseptic action which the pieces may have acquired will beshown by the presence of a transparent zone around them after theplate has been kept from one to two days. *This statement would suffer a restriction if it should be found that thedeep parts of decayed dentine contain non-cultivable bacteria. 340 THE DENTAL COSMOS. Fig. Apparatus used in method II. «, b, the two halves of a small glass vessel; c, a thin plate ofdecalcified ivory. Fig. 2.
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Keywords: ., bookauthor, bookcentury1800, bookdecade1890, booksubjectdentistry
