WASTE PAPERS. 73 



170. Wetting Bottle Fig. 27. The bottle is about 16 x 5 cm., 

 so as not to be easily overturned. The mouth is closed by a cork 

 through which are passed two slender glass tubes. One, the air- 

 tube, is straight, and reaches nearly to the bottom of the bottle ; the 

 other, the spout, extends but little below the cork, and is curved so 

 as to permit the ready application of the contents. 



171. Wetting Mixture. The cheaper commercial glycerin is 

 to be mixed with water in the proportion of 15 per cent, by measure, 

 or 12 per cent, by weight, and about 25 drops of clove oil is to be 

 added to each liter of the mixture. 



172. Waste Papers. These are pieces of paper of several 

 sizes, corresponding respectively to the slips, the sheets, and the 

 trays. 



The quality of paper is not material, so long as it is firm enough 

 to hold together when slightly wet. The "roll Manilla" paper of 

 medium thickness is strong and cheap, but the ordinary slips and 

 sheets which have been used by writing on one or both sides may 

 be kept for this purpose. 



With fine dissections, or when only connective tissue or small 

 muscles are to be removed, the waste slip may be placed in a corner 

 of the tray. 



With coarser work, and when skin, fat, and the larger muscles 

 or viscera are to be removed, use the waste sheet. 



When the cat is to be transected or eviscerated, or when some 

 larger animal is under dissection, have at hand extra trays contain- 

 ing the corresponding waste papers. 



The waste should be disposed of as soon as possible, but in case 

 the opportunity for re-examination is desired, the tray containing it 

 may be set aside, and the paper will obviate the objectionable 

 adhesion of the waste to the tray itself which might otherwise 

 occur. 



CARE OF INSTRUMENTS. 



173. In general, all instruments should be washed, thoroughly 

 dried, and slightly oiled as soon as possible after using. 



The washing may be done with a cloth or sponge, but the nail 

 brush should be used for the joints of nippers, and the teeth of the 

 saw. The wiping may be done with a towel, and then with a bit 

 of clota or chamois slightly oiled. 



All joints should be kept well oiled. 



