318 " Silurian System of Central Bohemia.'* 



consequently, also less mutation in the co-existing organic 

 world. 



We cannot now enter further on the rich field for specula- 

 tion which this portion of M. Barrande's work presents, or 

 notice the important conclusions at which he arrives. Still less 

 will our limits permit us to follow him in his critical review 

 of the various systems of classifying the trilobites, or in his 

 minute and elaborate descriptions of the genera and species 

 found in Bohemia. This portion of his work, with the 

 accompanying series of plates, must henceforth be in the 

 hands of every practical geologist who wishes to make him- 

 self acquainted with the form and structure of these most 

 ancient denizens of our globe. Even the zoologist, who 

 wishes to review the varied forms of Articulate organization, 

 will find it indispensable for his purpose, as containing not 

 merely the largest mass of materials, but many interesting 

 features in the form and structure of these animals which 

 we do not remember to have seen mentioned elsewhere. 



In conclusion, we would congratulate M. Barrande on this 

 successful result of his long and laborious undertaking. An 

 exile from his own land for loyalty to his prince, he has well 

 repaid the hospitality with which Bohemia received him, and 

 connected his name indelibly with her scientific history. 

 But in his success we must confess that we feel a special 

 interest, from the connection in which it stands with the 

 geological history of the British Islands. M. Barrande tells 

 us he was specially led to the study of these ancient rocks by 

 reading the Silurian System of Sir Roderick Murchison, which 

 proved to him, as to so many other geologists, a sure guide 

 in unravelling the mysterious history of the oldest of known 

 creations. The benefits he derived from this classic work 

 of our distinguished countryman he now repays with interest ; 

 and we expect soon to see the influence of M. Barrande's 

 valuable researches exhibited in new light dawning on many 

 obscure points in the geological history of our own land. In 

 this expectation we wish him all success in his labours, and 

 shall look eagerly for the appearance of the two remaining 

 volumes of this highly important work. We are glad to 

 learn that the engraving of the plates for these volumes is 

 now far advanced. 



