xvi Preface. 



the specimens for careful examination has also been frequent. 

 In all this the Conservator feels it but right to say that his 

 work has been greatly facilitated by the manipulative skill and 

 ingenuity, by the exactness and conscientious care, and 

 perhaps, most of all, by the unfailing patience and goodwill, 

 of his able assistant Mr George Eeid. 



