REVIEWS. 39 
Dana's theory of the gradual development of continents, a view which 
of late has been steadily gaining in adherents, especially in this country. 
The statement, however, that probably no stratified rock has been formed 
in deep water is open to serious objections. | The Chalk, the — 
p the Eozoonal limestone and others of like constituti 
composed in great part of qiiae animals especially si to 
flourish at great depths, and, probably, so far as we can judge from 
soundings and dredgings, covering at the edi day a large portion of 
-the Atlantic bottom. 
The des uie of the physical contrast between the shelving of the 
Floras shore and the abruptness of the Cuban side and Bahama reefs, 
minute pRa of the formation and disintegration of the rocks 
a the Double Headed Shot Key, Salt Key, and others, will be read with 
the greatest interest by all geologists. We could iot do justice to this 
part of the beige without quoting several entire pages, and this we 
have not spac 
Generally Eas the Keys are formed, according to Professor 
Agassiz, of fine coral sand, which is washed up on to the higher shal- 
hard as ce S MI cU of the sec ondary formation." 
Actinians as the lowest; the is kag eit wage and the Hale; pubs 
as the highest among the als. Among the Madrepores the se 
of the genera is Turbino 5g Fungia, Astrea and Mad ra. TIME 
Astreeans, xm assuming their s Eg frame, are ppt prd their first 
coral frame is Turbi portage d from that stage they pass into a 
Pcie condition, befo a assume their characteristic Astraean 
features.” It is next e that the succession of types in geological 
app 
the vertical distribution of these types on the seashore, the Turbinolian 
type is found first and is followed in succession by the P naa the 
Astræan, and the Madreporian types. ese views also seem to be i 
accord with those of Alexander Agassiz, who, as v dita cited, com- 
