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IN MODERN SCIENCE. 1 33 



nature for the doctrine of spontaneous evolu- 

 tion of species, and, I am sorry to say, a 

 striking contrast to the mixture of fact and 

 fancy on this subject which too often passes 

 current for science in England, America, and 

 Germany. Barrande's studies are also well 

 deserving th^^^ attention of our younger men of 

 science, as they have before them, more espe- 

 cially in the widely-spread Palaeozoic formations 

 of America, an admirable field for similar work. 

 In an appendix to his first chapter Barrande 

 mentions that the three men who in their 

 respective countries are the highest authorities 

 on Palaeozoic brachiopods. Hall, Davidson, and 

 De Konirick, agree with him in the main in his 

 conclusions, and he refers to an able memoir 

 by D'Archiac in the same sense, on the cre- 

 taceous brachiopods. 



It should be especially satisfactory to those 

 naturalists who, like the writer, had failed to 

 ses in the palaeontological record any good 

 evidence for the production of species by 

 those simple and ready methods in vogue 

 with most evolutionists, to note the extension 

 of actual facts with respect to the geological 

 dates and precise conditions of the introduc- 

 tion of new forms, and to find that these are 

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