18 DADD'S VETERINARY MEDICINE AND SURGERY. 
end in coma, which is the latter stage just referred tc, devuid o 
any imad or phrenitic symptoms, but marked by lethargy, or # 
prolonged comatose condition, from which no stimulus will 
arouse the patient. He is not only the subject of altered struc- 
ture within and around the brain, but the latter is compressed by 
the scrum, or pus, as the case may be, and thus sensibility is 
more or less destroyed. The degree of coma, however, will be 
lirectly proportioned to the degree of pressure. Now, tne readez 
will perceive that the proposition of treatment, just referred to, 
for the acute stage will not apply to the comatose condition ; fox 
here we have to stimulate and give tone to the system, so as te 
sustain the failing vital powers. 
In regard to this subject, Professor CopEMAN observes: “In 
inflammation of the brain, phrenitis, mad staggers, I have told 
you that it may be said to be impossible to distinguish, with any 
thing like certainty, in individual cases, acute inflammation of 
the substance of the brain from those affecting the membranus 
or ventricles. The reason will be obvious when we reflect that 
the phenomena, in every instance, are, in fact, attributable tc 
pressure on the entire contents of the skull, encephalon, viz : 
cerebrum, cerebellum, medalla, oblongata, and membranes; and 
if this be rapid and general, it can matter little whether it orig- 
inates from the membranes or the brain. Acute inflammation 
does, however, sometimes appear to invade at once the whole of 
the parts that are lodged within the skull; or, beginning in one 
part, it extends rapidly to all the rest. The symptoms which 
usually mark an attack of cerebritis are the following: The horse 
becomes sleepy, heavy, or more or less comatose, accompanied by 
general fever. After a time a convulsive attack supervenes, Hae 
becomes morose, and shows delirium; perhaps rears both fore- 
legs into the manger, from which position he may reel around 
and fall, kicking and tearing every thing about him. During 
the fit his respiration is mucn excited, and he sweats profusely 
If he gets upon his legs, he makes sudden and violent efforts, 
dashing against rack, manger, or stall, totally disregarding any 
thing that may be said or done to him. Thus he is continually 
struggling, panting, and perspiring, perhaps foaming at tho 
meuth, leading the ordinary observer to believe he is not only 
Aelirions but actually ‘mad.’ But all these symptoms ‘ary much 
in different cases. Coma occurs freauently, but ofte. nlx tem 
