1'LATK CX VI if. 



l bath. 



divided into two 



parts, an npperand lower, by a Imrixoiital -eptuni. from 



which a tube runs down n. -:.'in of the 



lower -lie. Tli,' npp.-r div laioD alld 



is tilled with meri-n: 



the cork of B, aod a 



and the liiirner. c, is an inner glass tube v 



are luted a small hole in c, 



the Maine from bein- extinguished. The gas enters 

 at / and p,. -he burner 



The instrumeut is set li 



it to the desind temperature, and then pushing dowii 

 ft till the end of p- touches the mercury. The gai 

 is then [irevented from passing through ,; and only 

 enough passes throii-h (lie hide ,1 to keep the Maine 

 alive, till, the instrument Incoming cooler, themereury 



ind allows the gas again to p: 

 the lower end of 0. 



./ 



: bath for experi- 

 ments mi digestion, 01 for evapor- 

 ating at a istant teiniiemture. 



This consists of two parts, the 

 hath itself,/, ami an apparatus, a, 

 for keeping the water in the ha'h 

 at a constant level. ,i, is a large 

 flask containing water. 6, c, is 



'lie open at hoth 



ends. </, >'.f. is a hent tube with 

 limlis of equal length. The end. 

 0, is put at the level at which the 



the hath, ;, is to 



llolh en, Is. ,/and/, are ahout an 

 inch helow e, M\d tints form a 

 syphon, the etleethe difference 

 the verti- 

 cal distance between c and il, or 

 atiout an inch. Whenever the 

 water in / falls below the level 

 of c. the syphon acts, and water 

 runs through it until the level in 

 i is as high as c, when it ceases. 

 H, is opposite a thermometer for 

 ling the temperature of 

 the bath. /), is 



The one represented here differs 

 somewhat froi.i that in tiir. 331, but 

 \pensive and has no 



advantage over the other. /', is 



~ the water-bath of nMvani/ed 



/inc or tin. The dotted line 



represents the le\el of the water. It i.s eo\eivd b\ a lar-r ].laie perforated with holes, in which beakers eoiitain- 



tive fluids or evaporating basins ,-an beput Theceiltn is the lATgl it, and contains the test-tube rack. 



When not in use the holes are covered by plates of /.inc. The pel torah ,1 plate itself can he removed, and a large 

 dialy/er, fig. 3i7. put in its place, when digestion and dialysis arc to be carried on at the same time. ?, is a tin 

 rack for boldiiiL' test-tubes in which digestive fluids are placed. The holes in the npin-r plate of therack are 

 numbered, so that the tuU-s m,-n -ity of attaching a label to them. Those in the 



lower plate are much smaller tha in the upper, and ser\e only to prevent the tubes from slipping aside. 



CM; of the syphon in washing prreipitati s by dec intatioii. 



