442 REVIEW — BRONCHOTOMY BREATHING-TUBES. 
ner as the string is of which the common halter-rope is composed, 
and about the same size, or, if any thing, somewhat smaller in 
volume than hempen ropes are in general. The strength of this 
metallic rope is incalculable — it would hold, not a horse merely, but 
a ship : it might, it seems to us, be made a cable of, or rather ship- 
cables might be made in such manner. Nor is the tin rope so 
objectionable in its weight, it not being heavier than the ordinary 
iron chain used in cavalry and other stables for fastening horses 
up. The copper rope, however, is objectionably heavy. Neither 
is the durability of the metallic rope at all doubtful ; that being, 
we should opine, hardly inferior to its great strength. 
The fault we find with the article in question is this : — The 
metallic rope when forcibly bent, to use the angler’s phrase, “kinks,” 
i. e., it remains bent; nor will the weight of the log annihilate 
or take out the flexure : the consequence whereof w r ould be a dis- 
position or liability to hang in the ring of the manger, instead of 
slipping through it readily as a hempen rope, even after being 
twisted, would immediately do ; from which would arise danger 
of the horse getting his leg over it. And, should such an accident 
happen, the injury accruing would be likely to be greater than 
what a hempen rope would inflict, and particularly were one of 
the wires composing the metallic rope to slip out of its coil, or 
break : indeed, then, there is no knowing what abrasion or lacera- 
tion might be inflicted. Such a pin-like presentment might rip 
open a bloodvessel. 
It is proposed, however, to encase the metallic rope in leather — 
make it a sort of nucleus to a leathern piping. This certainly 
would remove a part — and perhaps the most serious part — of our 
objection. There would still, however, remain a disposition to 
kink, and therefore there would be diminished freedom in its run- 
ning through the manger-ring. And, after all, we cannot say we 
like it near so well as the common halter-rope, or halter-strap. 
Bronchotomy Breathing-tubes. 
Mr. Dawes, veterinary surgeon, has been so kind as to lay 
upon our table two instruments of this denomination of foreign in- 
