Parturient laminitis it is that offers us the most striking illustration of the truth that a poisoned state of the blood-stream is a sure factor in the causation of an attack.  From the direct evidence of our senses (namely, manual exploration of the infected womb, and the stench of the exuding discharge) we know that we have in the interior of the womb matter in a state of putrescence.  From the experience of previous post-mortems we know, further, that the putrescent matter thus originating often gains the blood-stream, and forms foci of septic lesions elsewhere—­liver or lung.  When, therefore, during an attack of septic metritis a condition of laminitis supervenes, we are justified in attributing it to the escape of septic matter from the already infected uterus.

In the same category of laminitis from metastasis may also be placed the laminitis occurring as a result of an overdose of aloes.  The enteritis thus set up is often followed by laminitis, and that of a serious type.

Prolonged and excessive work upon a hard road is also apt to induce an attack.  When this occurs it in many cases resolves itself into a case of cruelty. (See reported case, No. 1, p. 279.)

Laminitis from this cause was frequent among coach and carriage horses in the pre-railroad period, and resulted from attempting to obtain from the animal a faster pace and a greater number of miles than he was physically capable of giving.

In our day, however, it is more often a result of gross feeding, combined with only that amount of work which the horse, if ordinarily fed, would be easily able to perform.  An excellent example of this is the laminitis occurring in the Shire stallion when commencing his rounds of service in the spring and early summer.  At this season these animals are constantly supplied with a more than sufficient supply of a highly stimulating and nutritious diet.  In this case the blood is already in that state in which it is predisposed to the disease.  Add to this the unwonted exercise—­for during all the winter the animals are idle—­and congestion of the venous apparatus of the extremities is not to be wondered at.

Passing from these, the more common, we may consider other and less frequent causes of the disease.  Congestion of the laminal blood-vessels and consequent laminitis occurs when animals are made to maintain a standing position for prolonged periods, as, for instance, when making sea voyages.  A long and painful disease of one foot, necessitating the whole of the weight being borne by the other, ends often in laminitis of the second member.  It may thus occur as a sequel to quittor, complicated sand-crack, suppurating corn, and punctured wounds of the feet.

Laminitis has also been known to occur as a result of septic infection of the blood-stream consequent on the operation of castration. (See recorded case, No. 2, p. 281.)

A sudden lowering of the surface circulation at a time when the animal is excessively perspiring is also said to favour an attack, as also is the giving to drink of cold water to an animal just in from a long and tiring journey.  Also, according to Zundel, ’the influence of the season cannot be denied, and it is during the summer months that laminitis is more frequent, while it is rare in winter, as well as in the spring and autumn.’