* 
On the Blast Furnace in the Manufacture of Fron. 95 
these would then separate at the point where this force is’ re- 
ed. 
* mov 
It isa popular error which supposes that the separated joints 
or segments reunite, and that they will come together even if sep- 
arated to a considerable distance. The spinal marrow and large 
artery run through the entire length of the animal, the former 
occupying a canal which passes between the crura of the superi-. 
or spinous apophyses; the latter in one which lies between the 
crura of the inferior spinous apophyses. In separating the bones 
from one another, these important organs are of course broken, 
and the death of the separated segments is an inevitable conse- 
quence. ‘I"he animal, however, acquires a new tail by growth. 
When first healed the animal ends in an abrupt truncation, which 
is covered with small scales, arranged in concentric circles around 
its centre ; but in course of time, this truncated extremity begins 
to séchive. a conical shape, which gradually takes a more pro- 
jecting and tapering form, the circles of scales then assume the 
position of rings, which surround and cover it; and by slow 
growth the tail acquires about its wonted length. 
This arrangement is interesting, privicipally, from being a new 
_ and application of the muscular structure. Notwithstanding 
modifications which the muscles undergo, in assuming this 
pst eer may fix upon the particular muscles of which 
the fascicles are formed. ‘The muscles which form these fasci- 
cles are, principally, the a the longissimus dient the 
inter-transversales, and some others 
Arr. XIIL— Observations on the more recent researches in the 
Manufacture of Iron, (continued ;*) by Dr. J. Lawrence Surtu, 
of Charleston, S. C. 
“In the last article on this subject, the operations of the blast 
furnace alone were alluded to, and among the statements then 
given, was that of the composition of the gas taken from the 
mouth of the furnace; which gas contained about 24 per cent. 
of carbonic oxide, this representing a large portion of the com- 
bustible used, which is lost in most of the ne now in ope- 
ration in this country. 
hood OS ee 
* See this Journal, Second Series, i, 170. | 
