PREFACE

 In writing the following story, the author has had in view no purpose other than that of affording entertainment to such readers as are interested in problems of crime and their solutions; and the story itself differs in no respect from others of its class, excepting in that an effort has been made to keep within the probabilities of ordinary life, both in the characters and in the incidents.

 

Nevertheless it may happen that the book may serve a useful purpose in drawing attention to certain popular misapprehensions on the subject of finger-prints and their evidential value; misapprehensions the extent of which may be judged when we learn from the newspapers that several Continental¹ commercial houses have actually substituted finger-prints for signed initials.

 

The facts and figures contained in Mr. Singleton's evidence, including the very liberal estimate of the population of the globe, are, of course, taken from Mr. Galton's great and important work on finger-prints; to which the reader who is interested in the subject is referred for much curious and valuable information.

 

In conclusion, the author desires to express his thanks to his friend Mr. Bernard E. Bishop² for the assistance rendered to him in certain photographic experiments, and to those officers of the Central Criminal Court who very kindly³ furnished him with details of the procedure in criminal trials.

1 continental   

adj.大陆的，大陆性的，欧洲大陆的

参考例句：

• A continental climate is different from an insular one.大陆性气候不同于岛屿气候。
• The most ancient parts of the continental crust are 4000 million years old.大陆地壳最古老的部分有40亿年历史。

2 bishop   

n.主教，（国际象棋）象

参考例句：

• He was a bishop who was held in reverence by all.他是一位被大家都尊敬的主教。
• Two years after his death the bishop was canonised.主教逝世两年后被正式封为圣者。

3 kindly   

adj.和蔼的，温和的，爽快的；adv.温和地，亲切地

参考例句：

• Her neighbours spoke of her as kindly and hospitable.她的邻居都说她和蔼可亲、热情好客。
• A shadow passed over the kindly face of the old woman.一道阴影掠过老太太慈祥的面孔。