636 ON EMPHYSEMA OF THE LUNGS. 
not a particle of air finds its way into the interlobular partitions; 
nay, that these partitions may themselves be lacerated, and yet 
no interlobular emphysema be produced. Farther observations 
are required to elucidate this subject. 
This form of emphysema is as rare as the other is common. 
It is very seldom combined with the true pulmonary emphysema ; 
and in the great majority of cases seems to result from some 
sudden and violent effort of the respiratory muscles, as in the 
forcing pains of childbirth, in raising heavy weights, in hooping- 
cough, &c. Notwithstanding the greater density of their lungs, 
children appear to be more liable to this disease than adults*. 
The only symptom from which the existence of this disease 
can be suspected, is the sudden supervention of dyspnoea after 
any violent effort of the lungs. Its stethoscopic signs are the 
dry crepitous rale with large bubbles, and the friction of ascent 
and descent already described. These sounds, it will be recol¬ 
lected, are likewise common to the vesicular form of emphysema 
when the pleura is projected by several air-cells thrown into one,’ 
perhaps the only method of distinguishing between these cases 
is by the sudden supervention of the dyspnoea and of the stethos¬ 
copic signs in the interlobular form of the disease : fortunately, 
however, the diagnosis is r \i a matter of much practical impor¬ 
tance, as in the slighter ases (in which alone any ambiguity can 
exist) the air appears to be always absorbed, and the interlobular 
partitions gradually return to their natural state. When the 
aerial infiltration extends to the external parts, the difficulty of 
diagnosis is at once removed, and the disease may be treated on 
the principles already stated in the preceding article on general 
emphysema. 
THE VETERINARIAN\ NOVEMBER 1, 1832. 
Ne quid falsi dicere audeat, ne quid veri non audeat.— Cicero, 
Our leading article will be a kind of omnium gatherum—a 
collection of scraps—not wholly uninteresting or uninstructive— 
picked up in a late journey undertaken by one of us. For the 
greater part of them we are indebted to a veterinary friend, Mr. 
Dick, who deservedly ranks high in his profession ; who, for 
many a year has honourably and successfully laboured in the 
cause of veterinary science, and who will soon have to urge yet 
stronger claims on our esteem and gratitude. 
* Laennec. 
