CHAIN HOOKS. 65 



strong wire netting, and always open a little at the top. In summer the ventilation 

 cannot be too free ; in winter the room should be kept at a moderate temperature (10 to 

 15 C.). 



At least once a year, the room should be thoroughly cleaned, and then washed with a 

 solution of sulphate of iron. Benzine should be poured or sprayed into all the corners 

 and cracks to kill the fleas. If possible, the room should be vacant during the hottest 

 months. 



Shallow boxes of dry earth should be placed upon the floor, and the earth changed 

 frequently. Should soiling of the floor occur, the feces should be removed at once, the 

 spot well washed and saturated with some deodorizer, and then covered with a box. An 

 uncleanly cat should be promptly removed. The male cat is retromingent ; if one side of 

 the earth boxes reaches to the height of about 30 cm. (about 1 foot) above the earth, the 

 walls of the room may be protected from their strong-smelling urine. 



Cats like separate beds, which may be provided by placing boxes containing a little 

 liay or " excelsior " along the sides of the room, preferably at a little distance from the 

 floor. The cats are better pleased if half the top of the box is left upon it. 



Fresh catnip should be strewn about the room occasionally when obtainable ; the dried 

 herb is a good substitute in the winter. 



Graham crackers and water should always be accessible, milk should be supplied 

 daily, and meat once or twice a week. The milk vessels should be kept clean. 



140. Chain Hooks (See Codman cfc Shurtleff, A, 43, Fig. 14). 



These are used for fixing or suspending parts under dissection. 



In most cases, with so small an animal as the cat, these purposes 



can be accomplished "by the use of the " small compressor," with 



strings or straps of appropriate length. 



141. Compressor, Small Fig. 13. This name is given to 

 what is known among dealers in wearing apparel 

 as the " Royal Garment Clasp, No. 1." The 

 spring which closes it is quite strong, and the 

 sharp teeth enable it to retain its hold under 

 considerable tension. By means of the eyelet, 

 FIG 13 SMALL COM- tlle compressor may be attached by a string or a 



FSOB ; x i ; 141. strap to the loop at the side of the tray. For 

 some purposes the teeth may be removed. 



142. Dissecting G-own. In some cases, the clothes are suffi- 

 ciently protected by an apron and pair of sleeves, or even by a 

 towel upon the lap. But generally, especially while injecting, 

 removing viscera, preparing bones, or performing experiments, one 

 should wear a gown of some smooth black stuff, like silesia. The 

 gown should nearly reach the ankles, and the sleeves should be 

 held at the wrists by elastic bands. It may open in front, or behind, 

 but the buttons should be concealed lest they catch upon the edge 

 of a dish or jar. Soiling of the wristbands by the dye of the gown 

 may be prevented by facing the sleeves with white linen. 

 5 



