iv DEDICATION. 



found more complete in ita illustration of the Palaeozoic forms of Bryozoa than 

 any work yet published. 



Of the mechanical and artistic execution of the work I may speak in general 

 commendation, and of some portions with unqualified praise. In regard to its 

 scientific merit, I can only express the hope that students in Natural Science, 

 and the enlightened educators of our State and Country, may find this volume a 

 contribution worthy of their acceptance, and a source of material for that higher 

 education and intelligence, which the people of New York so earnestly desire ; 

 and in this respect I hope that this volume may commend itself to your Excel- 

 lency, as worthy of a place among the series of volumes already comprised in 

 the Natoral History of the State of New York. 



I have the honor to be. 



With great respect, 



Your obedient Servant, 



JAMES HALL, 



Slate Geologist. 

 Albakt, August, 1887. 



