vi PEEFACE 



the central nervous system, and the special senses) ; Part II. of 

 elementary physiological chemistry ; Part III. of advanced experimental 

 physiology ; and Part IV. of advanced physiological chemistry. 



The experiments upon the physiology of muscle and nerve are based 

 upon the course given at Guy's Hospital a course modelled on a 

 reduced scale upon the excellent practical courses given at Oxford by 

 Professor Burdon Sanderson and Professor Gotch. The experiments in 

 this section have been limited as far as possible to those which can be 

 conveniently performed with simple apparatus by a large class of 

 students. For this reason the experiments with the galvanometer and 

 capillary electrometer have been restricted to demonstrations, and very 

 few details of such experiments are given. 



There are some important experiments upon the circulation and 

 respiration, which for various reasons cannot be properly performed by 

 the student ; these have been collected together as demonstrations in 

 Parts I. and III. 



The subject of vision is so important from a medical as well as a 

 physiological and psychological point of view, that it has here received 

 more extensive treatment than is usually the case in works on practical 

 physiology. 



In those portions of the book which treat of physiological chemistry, 

 an attempt has been made to demonstrate, step by step, the chemical 

 relationships which exist between the various substances, and to illus- 

 trate, by suitable experiments, the different properties of those bodies. 

 The drawings of crystals were executed by Mr. W. E. M. Turtle, to 

 whom the authors are deeply indebted. 



Figures have been borrowed from The Physiological Action of 

 Drugs, by M. S. Pembrey and C. D. F. Phillips. For the loan of 

 numerous blocks illustrating physiological apparatus the authors are 

 indebted to Messrs. Baird & Tatlock, of Hatton Garden, E.G. The 

 sources of other diagrams and tracings, which have been borrowed, are 

 indicated in the description of the figures. The initials of the author, 

 who took the record of the original tracings, are appended to the 

 respective curves. 



Sept., 1902. 



