VI 



Preface 



at, and with the help of the numerous illustrations the reader will be 

 able to refer any fish to the particular run to which it belongs, to 

 ascertain its weight and age, and how often it has returned to fresh 

 water. Although about sixty illustrations of scales are given, 

 thousands had to be collected at all seasons and examined carefully, 

 so that a definite conclusion could be arrived at. The illustrations 

 are from photographs which, with one or two exceptions, were taken 

 by the author from selected specimens. 



To Mr. Charles Baker, High Holborn, London, he is indebted 

 for enlarging the photographs of the scales; to the Swantype Co., 

 for the blocks from which the illustrations are taken ; and to the 

 printers, Messrs. R. & R. Clark, who have carried out the work to 

 his entire satisfaction. 



P. D. M ALLOC H. 



Perth, Dccemlh-?- 1909. 



