q 



r 



190' 



PREFACE 



THE following directions are based upon an ex- 

 perience of many years in University College, Lon- 

 don, where such a course of instruction was first 

 instituted by Professor Burdon-Sanderson. Al- 

 though they have long been in use I have now 

 had them printed for the convenience of my 

 Edinburgh students. There are several text-books 

 dealing with the same subject, but they are all 

 more elaborate, and concern themselves with many 

 problems which the average medical student can- 

 not be expected to investigate for himself. On 

 this account perfectly simple instructions dealing 

 only with such elementary exercises as can readily 

 be worked out by even a large class, may, it is 

 hoped, prove useful to other teachers and students 

 than those for whom they are primarily intended. 



205 



