94 StJEGIOAl THEEAPEUTICS. 



maintained in position by means of compresses, rollers or band- 

 ages, as the case may require. 



Eollers are long bands of muslin, linen, or ticking, or broad 

 tapes, which are used principally in dressing wounds of the ex- 

 tremities, or of regions liable to much motion. Their length and 

 width vary, according to the requirements of the case. The sur- 

 geon will do well to assure himself of the dimensions of these, 

 and to ascertain that the roUers are of ample length, with some- 

 thing to spare, which excess in length can be cut off. Deficiency 

 in the length of a roller will interfere with a perfect completion 

 of its application. If too wide, it may prove difficult to apply it 

 neatly, while if too narrow it may have a tendency to act like a 

 Ugature, and make even pressure difficult, besides being more 

 Kable to slip and become loosened. EoUers are applied either dry 

 or moist. "When moist, they become loose in drying, and their 

 action becomes insufficient. Dry rollers ought, therefore, to be 

 preferred. 



Bands or rollers are prepared ia two ways, either by being 

 rolled on one or on both of their extremities, and are therefore 

 called the single or the double roller. In applying it, the extrem- 



FiG. 83 — Single and Double EoUer Bandage. 



ity is first folded tightly to make a small cylinder, which is held 

 by its extremities between the thumb and index finger of the left 

 hand, resting by its width between the same fingers of the right; 

 and whUe the fingers of the left hand turn the smaU central cylin- 

 der, the band is roUed upon it to its end. EoUing on both ends 

 IS done in the same manner. When half of it is roUed, a pin wiU 

 secure it and prevent it from becoming slack until the other half 

 is made ready to be used. In rolling the bands, sHght traction 

 should be made at intervals by the thumb of the right hand, whUe 

 the fingers of the left keep the central cylinder steady-the object 

 of which IS to have the roUer firm, hard and sohd. 



In large estabhshments, or even in private practice where 

 great numbers may be required, the use of the smaU apparatus 

 represented in Figure 85 wiU be found very advantageous, the 



