CONTENTS. 



PAGE 



Action of drugs on the muscle twitch, . ' 45 



Involuntary muscle, 45 



CHAPTER III. 



NERVOUS SYSTEM. 



Reflex action, 47 



Reaction time, 50 



Removal of the cerebrum of the frog, 51 



Removal of the cerebrum of the pigeon, 52 



Removal of the cerebellum of the pigeon, 52 



Hemisection of the spinal cord, 52 



Stimulation of the motor area of the dog's brain, 53 



Division of the semicircular canals, 54 



Determination of the number of impulses discharged by a nerve ceil in 



a unit of time, . 55 



CHAPTER IV. 



BLOOD. 



Coagulation of the blood, 56 



The number of red and white corpuscles, 59 



Changes produced in the corpuscles by variation of osmotic pressure, 62 



Microscopic examination, 63 



Staining the blood cells, 64 



Classification of the leucocytes, 66 



Differential count of the leucocytes, 66 



Estimation of the haemoglobin, 68 



Estimation of the specific gravity, 71 



Haemoglobin and its derivatives, 73 



Spectra of haemoglobin and its compounds, 75 



Globulicidal action of serum, 77 



CHAPTER V. 



CIRCULATION or THE BLOOD. 



Study of the circulation in the frog's web, 80 



Migration of the leucocytes, 81 



Direct observation of the action of the frog's heart, 82 



Graphic record of the frog's heart-beat, 84 



Influence of temperature upon the beat of the frog's heart, .... 85 



[vi] 



