432 STRUCTURE OF THE MEDIASTINUM IX THE HORSE. 
know. One of my ewes seemed to me to be consumptive, and l 
kept her in a stable, and fed her with whatever she would eat, 
oats, oil-cake, hay, turnips, or tea-leaves — no very scientific feed- 
ing, you will say. She retained her strength until the lambing 
time came, and then she brought me a lamb with an enlarged 
neck. 
u The tutor in my family amused himself with feeding, in a 
small yard close by mine, half a dozen nice ewes. He fed them 
with poor hay, but the best oats; and they had nothing but snow- 
water to drink until late in March, when they drank of the same 
swamp-water as my sheep. All their lambs came perfect. 
“ I sold six full-bred Merino sheep and six grade (q y . half-bred ?) 
sheep that were fed with a quart of oats per day, and drank at 
a spring. All their lambs came with enlarged glands. 
“ I will only remark, that of the lambs that did well, the swell- 
ings seemed loose and almost pendulous; yet the breathing was 
difficult and spasmodic, and there was mucous discharge from 
the nostrils. One lamb with these swellings died very fat, and in 
another the swellings have much decreased. 
“ Within the last twelve months, I find that no less than six of 
my ewes have enlarged necks, and which does not seem to incon- 
venience them in the least; they, however, are not ewes that 
carry much flesh. The old sheep shewing this enlargement has 
a little puzzled me;” 
THE STRUCTURE OF THE MEDIASTINUM IN THE 
HORSE. 
At the sitting of the Royal Academy of Medicine, Dec. 6th, 
1836, M. Bouley, M. V., called the attention of the Academy to the 
structure of the mediastinum in the horse. (In France the vete- 
rinary surgeon is a frequent and welcome visitor at these assem- 
blies). “ Pleurisy in the horse/’ said he, “ is a serious and fre- 
quently fatal disease, if it is unskilfully treated or neglected at 
the commencement. The rapid and long-continued exertion 
which is often exacted from this animal, the changes of tempera- 
ture to which he is exposed, and the consequent change in the 
function of the perspiratory organs, afford a satisfactory explana- 
tion of the frequency of this disease; but they do not elucidate 
the cause of its serious character.” 
M. Bouley occupies himself in searching for this cause, and 
he believes it to be found in the peculiar organization which the 
mediastinum of the horse presents. The posterior mediastinum 
in that animal has neither the appearance nor the texture of 
