24 



GENERAL PHYSIOLOGY 



By the perfection of this technique du Bois-Reymond made the 

 galvanic current of all stimuli the most convenient to employ and 



Fig. 1. — /. Ludwig's kymograph. One limb of the manometer is connected with an artery at A • 

 the blood-pressure is transmitted to the column of mercury (represented in black), thence to 

 the float upon the mereury in the other limb, and puts this rtoat with its writing-lever in 

 motion. The writing-lever inscribes its movements uptrn the drum, C, which is kept In 

 constant rotation by a clock-work, B. (From BrUcke). 77. Pulse-curve from a i-abhit. The 



r- small waves represent the variations in blood -prt;ss\n-e that cniistitute the pulse; the large 

 waves, the variations that the blood -pressure undergoes as the result of respiration. 



the most capable of fine gradation and easy localisation for nerves 

 and muscles; for these reasons it now holds the first place in 

 stimulation-experiments. 



