MR. TURNER’S THEORY OF ANIMAL HEAT. 493 
air does not arise more from the quick and violent friction than from 
actual compression. Therefore, unless Mr. Turner can bring 
forward some sounder arguments in support of his new theory, I 
contend that it must fall to the ground. 
In addition to this, I would beg to inquire, how this gentleman 
accounts for the lowest order of animals, as also plants, possess¬ 
ing a power of supporting a temperature of their own; and 
whether he considers that such power is likewise dependent on 
mechanical principles ? 
For my own part, in order to account for the maintenance of 
the temperature of the arterial blood of a living animal body, 
I neither accord with the generally received theory of latent and 
sensible heat of the late Dr. Crawford, nor with the newly ad¬ 
vanced one, by Mr. James Turner, of palpable heat , the effect of 
mechanical qyressure. In short, I consider that there is no such 
thing in existence as latent heat ; and that what we call heat is 
not a tangible substance , as the majority of physiologists and 
chemists have erroneously supposed, but one of the phenomena 
or effects which is constantly occuring during the revolving 
change of matter from one form or state to another ; and that to 
theorize about the matter of heat, being in a latent form , is just 
as absurd as to state, as a real fact, that a thing existed as a 
tangible substance , without our having made any palpable dis¬ 
covery thereof. 
[To be continued.] 
A CASE OF PERFORATION OF THE DUODENUM 
BY BOTS. 
By Mr, J. T. Brewer, V,S., Tavistock, 
As I do not recollect to have seen any account ofbots having 
eaten their way through the intestines, with the symptoms 
accompanying the same, I am induced to forward to you a case 
which lately came under my notice. 
I was called on to attend a mare, the property of J. H. Gill, 
Esq., of Bickham, near Plymouth, on the 16th of April last. 
Her symptoms were, a continual restlessness, often looking back 
towards her sides, pawing her litter, striking her belly with her 
hind legs, occasionally lying down, entirely off her appetite, 
extremities rather cold, mouth hot and dry, the Schneiderian 
membrane highly injected, breathing a little quickened, pulse 
sixty, but strong and hard ; she likewise appeared to be costive. 
The mare for some days previously had been observed to 
carry her head very much on one side, contrary to her usual 
