412 DISEASES OF THE AETEEIES. 



large plug of adherent fibrin in the aorta post., just where 

 this vessel divides into two iliacs on each side. (In the horse, 

 you will remember, there is no ' common iliac/ but the aorta 

 post, divides into the internal and external iliacs.) This 

 plug was firmly adherent to the roof of the artery; that is, 

 to that part lying in contact with the vertebrae. It was not 

 sufficiently large to obstruct the stream of blood completely, 

 but it must have caused a material lessening of the stream. 

 The internal iliacs, however, were completely plugged up, 

 and the outside of the fibrinous clot was adherent to their 

 walls in many places all the way round. In one place, 

 especially, a calcifying process is taking place in the coagu- 

 lum. If such things are not already too familiar to you, I 

 wish you would look in at Clyde Street any day before two 

 P.M., for the condition is to me somewhat new. Yours ever 

 truly, JOHN BAKLOW." 



It is not easy to trace the origin of this disease in the 

 horse. It is chiefly seen in young animals in good condition, 

 and would appear to be characterised by periodic relapses. 

 It is the arteries of hind limbs that are most constantly 

 plugged, and as a typical case of this kind, I may relate the 

 following : 



On the 26th of July, 1858, 1 was requested, to see a valuable 

 coach horse, four years old, which a fortnight before had sud- 

 denly shown signs of severe lameness in the near hind leg, 

 whilst being exercised on the sands at Portobello. The horse 

 was rested after this, and the lameness, though not so severe 

 as at first, did not subside, and I was accordingly consulted 

 respecting its cause. I observed that the horse was affected 

 with spavin, though the bony enlargement was slight. The 

 horse was stiff, and I afterwards learned that awkward action 

 of the near hind leg had been observed six months before by 



