WEIGHING PAN. 69 



upon ordinary scales. For most anatomical purposes, therefore, the 

 scales need not be arranged for more than 4-5 kilos., or about 10 

 Ibs. avoir. Weights of less than 1 gram should be determined by 

 the smaller or " prescription " scales. 



Of the larger scales there are two styles, the " open " and the " box." An example of 

 the former is the " Druggist's trip scales," figured by J. & H. Berge, A, 63 ; of the latter, 

 is the " Ebony box scale," figured by Whitall, Tatum & Co., A, 74. With a capacity of 

 10 Ibs., the former costs $7, and the latter $14. In selecting scales, it would be well to 

 obtain the advice of some chemist or physicist. 



154. Weighing Pan. The scale pans accompanying the scales 

 above mentioned are about 20 cm. in diameter, and will contain any 

 separate organ of the cat, or the head or limbs. For weighing an 

 adult cat entire, a larger pan is needed. For this purpose, one of 

 the ordinary trays, 30 x 40 cm. may be used, but it is better to pro- 

 vide a special pan. It should be oval or oblong, about 25 x 35 cm., 

 made of stout tin, and with a rim about 3 cm. high. Its weight 

 may be diminished by punching out disks not more than 1 cm. in 

 diameter, until it exactly balances some weight, as 500 grams, 

 or a piece of lead, which, of course, must be used always with the 

 pan. If the cat to be weighed is stiff, it may sometimes be made to 

 rest upon the ordinary scale pan without touching anything ; other- 

 wise this special pan should be used, the arms and legs and tail 

 being kept within it. 



155. Scalpels Figs. 22, 23, 24. These are single edged, and 

 thin bladed knives, with ebony or ivory handles. The medium size 



FIG. 22. 



FIG. 



L-L_' 



FIG. 22. LARGE SCALPEL, for sections of brain, etc. ; 155; x .5. FIG. 23. MEDIUM- 

 SIZED SCALPEL, for ordinary dissecting ; x .5 ; 155. FIG. 24. CHARRIERE 

 SCALPEL, for finer dissecting ; x .5 ; 155. 



(Fig. 23) answers for most purposes, and will last a long time if care- 

 fully used. The "Charriere" is employed for finer but not the 

 finest dissecting, and the large scalpel should be kept perfectly 

 smooth and keen for making macroscopic sections of the brain, 

 etc. 



