53 CTJEBENT rOECE CHAP. IV. §. V. 



piece of copper wire ; each of these wires clipped, to 

 the extent of a quarter of an inch, into the water. 

 We thus had a resistance consisting of a column of 

 water, nearly half an inch in diameter, 3 inches and 

 a half in length, and 6 inches of copper wire. By 

 this arrangement the current could be made to 

 travel through the galvanometer, with or without the 

 resistance, at pleasure, by merely dipping the elec- 

 trodes into one mercurial cup or the other, and 

 without any loss of time. 



Experiment 1. — Eabbit. Pithed. Between renal 

 vein and bladder; witfe resistance, vibrations; toithout, 

 3° or 4° : vdth, vibrations ; without, vibrations. 



Between left bronchus and left ventricle; with 

 resistance, no effect; withovt, 4°: with, 3° or 3°; 

 without, no effect. 



Between gall-bladder and blood from vena cava 

 inferior; with resistance, 5°; without, 8°: with, 5°; 

 without, 10°. The motion of the needle with the 

 resistance was slow and steady. 



Experiment 3. — Eabbit. Pithed. Between right 

 bronchus and left ventricle ; vrithout resistance, 3° or 

 3° ; loith, vibrations : without, vibrations. 



Between gall-bladder and blood from vena cava 

 inferior; without, 10°; with, 3° or 4°: without, 10°. 



Between renal vein and bladder ; no effect either 

 with or without the resistance. 



I wiU not attempt to deduce any conclusions 

 from these experiments as to the/orceof the current, 

 but leave it for the physical philosopher to decide 



