(a) Three species of worms, the Dochmius trigon-ocephalus) the Strongylus gigas, and the Filiaria hematica, have been found in the blood of the dog, or in its heart.

Of these, the filiaria is much the most common. It has been met with in immense numbers by Gruby and Delafond, circulating with the blood in the larval state, and taking up its abode in the right cavities of the heart and in the pulmonary artery when it reaches maturity. The larvae are so small that they cannot be seen without the aid of a microscope. They either produce no symptoms whatever, or, when they are situated about the heart, excite convulsions, and induce sudden death from stoppage of the heart. Voracity of appetite is almost invariably present.

(b) The Spiraptera sanguinolenta has been met with by Morgagni and other observers, lodged in small tumours in the walls of the aorta, and in connexion with the vessels of the kidney.

(5.) In The Brain

Dupuy has found on the surface of the dog's brain a large number of hydatids; - cysticerci, according to Rudolphi. Youatt says, "Hydatids have been found in the different passages leading to the cranium, but they have not penetrated." What does this mean?

Probably "Turnside," a disease sometimes met with in dogs, and analagous in symptoms to sturdy in sheep, may depend upon the presence of hydatids.