58 



gigantic Dinornis exhibit no difference in structure from those of its 

 now only existing representative, the Apteryx. The bones of the 

 Mastodon and the huge Megatherium, the giants of the land, are no 

 more remarkable for the coarseness of their structure than are those 

 of the smallest of the mammiferous quadrupeds, the mouse, and 

 such has been the prevailing law from the commencement of the 

 earth's existence, and such, no doubt, will continue to the end of 

 time. 



MEASUREMENT OF BONE-CELLS IN PARTS OF AN ENGLISH INCH. 



TRANSVERSE SECTIONS. 



Human 



Ostrich 



Turtle 



Conger Eel 



f one of the 

 \ one of the 

 f one of the 

 1 one of the 



Long diameter, 



Short diameter, 



Long diameter, |^°JJ* 



Short diameter, 



Long diameter, 



Short diameter, 



\ one of the 



| one of the 



\ one of the 



J one of the 



\ one of the 



( one of the 



\ one of the 



T ,. f one of the 



Long diameter, 1 ,„„ rtf+ i,„ 



° ' ( one oi the 



r., . j. { one of the 



Short diameter, | oneofthe 



largest, ^ 

 smallest, ^ 

 largest, ^ 

 smallest, „£, 

 largest, ^ 

 smallest, 2 ^j 

 largest, ^ 

 smallest, ^ 

 largest, 3 ) 5 . 

 smallest, ^ 

 largest, T ^ 

 smallest, ^ 

 largest, j^. 

 smallest, -j^ 



largest, i 

 smallest, g^, 



