THE HAND AS AN UNRULY MEMBER. 631 
rocks containing the myri oe i's timo in Fig. 4. Copied from 
Dr. gen: s figure, greatly magnifie 
g. T. Homothetus fossilis. R Popii insect from maa Devo- 
nian ots of New Brunswick; it was discovered by Mr. Ha 
Fig. 8. Huplophlebium Barnesii. A curious neuropterous ae of 
large size, probably nm ed to our May-flies; taken by Mr. Barnes from 
the = of Cape Bre 
These figures, ie re exception of 1, 4, and 6, are of life ma and 
borrowed from the new edition of Dr. Dawson’s Acadian Geology. 
THE HAND AS AN UNRULY MEMBER. 
BY BURT G. WILDER, M. D. 
(Concluded from page 491.) 
Fracture or Crossing. This is the name given to a 
view of the limbs, which, under various modifications, 
has been entertained by four celebrated anatomists, Bour- 
gery, Cruveilhier, Flourens, and Owen. Its essential 
feature is the pronation of the forearm so as to bring the 
thumb on the inner side, opposite the great toe; but this 
has the effect of crossing the radius upon the ulna, so that 
its upper end is to the outer, while its lower end is to the 
inner side of that bone. This condition of things, though 
contrary to the relation of the corresponding parts in the 
leg, is accepted by Owen* and Flourens, who simply 
seek to show that the front of the arm really corresponds 
to the front of the leg, and vice versa, so that the concav- 
ity of the elbow is made to represent the convexity of 
the knee ; but the other two anatomists try to explain the 
crossing of the bones, upon an idea which was distinctly 
enunciated by Cruveilhier, in the following propositions : 
“1. Neither bone of the leg is represented by a single 
bone of the arm. 
*Comparative Anatomy of Vertebrates, ii. 310, 360. 
