IV PREFACE. 



dates in their preparation for the higher examinations in 

 physiology, of the University. 



To the " Practical Exercises " I have added a series of 

 " Demonstrations." Under this heading I have given an 

 account of experiments which, although they are of such 

 fundamental importance that every student ought to wit- 

 ness them, cannot be advantageously repeated. These 

 are given during the winder session, all students who 

 have already attended the summer practical course being 

 invited to attend them. 



