618 DR THOMAS R. FRASER ON PHYSOSTIGMA AND ATROPIA. 



administered to an animal that had previously recovered from the combined 

 administration of atropia and physostigma) ; for the symptoms were always very 

 much the same, and a sufficient account of them has already been given in 

 Section A. The a and b portions of each experiment in which they occur were 

 performed on the same animal. 



According to the system of enumeration that has been followed, the number 

 of the experiments contained in this paper appears to be 331. This number, 

 however, does not adequately represent the labour involved in the research, 

 for it includes 159 experiments that consist of two parts (a and b), and one that 

 consists of three parts (a, b and c) ; and as each of these parts is in reality a 

 separate experiment, the total number is 492. 



All these experiments were performed in the Materia Medica Laboratory of 

 the University of Edinburgh, and I cannot sufficiently express my gratitude to 

 Sir Robert Christison for having placed his laboratory at my disposal. 



[This Paper was received for publication on Friday, November 10th, 1871. 

 Since that time, several additions have been made to it by the Author, the 

 most important of which is the insertion of Diagram 7 and its accompanying 

 description.— J. H. B. March \th, 1872.] 



