_Treatment._ Majendie and others had a few apparent recoveries after violent counter-irritation over the spinal cord (cervical and dorsal). Coculet and Lafosse claimed recoveries from the prolonged use of nux vomica in large doses (up to 5 drachms). Hayne attempted evacuation of the fluid by puncture through the perforated plate of the ethmoid bone, but had evil results from the ensuing hæmorrhage and encephalitis. Aseptic puncture through the plate of the frontal bone would be much more promising. Klemm suggested hydrochlorate of pilocarpin (15 grains), and this would promise better than any other measure to induce absorption of the liquid. The fatal drawback to this as to other measures is that it is not applied until the slow, steady pressure has caused such extensive cerebral atrophy that, even if the liquid could be removed and its reproduction prevented, the lost functions can never be restored. If the disease could be diagnosed and treated before this change of structure had taken place, the hope of recovery would be much better founded. Even in cases which make a temporary recovery during cold weather one would be warranted in using active derivatives toward the bowels and kidneys, also pilocarpin, counter-irritation to the spine and even tapping of the ventricles. Legal Aspect of Chronic Hydrocephalus. To claim relief in case a horse affected in this way is sold as sound, the seller must be notified at an early date. In the different countries of Europe a limit is set after which such notification will have no legal value. The seller must be notified, in France in 9 days, in Saxony in 15 days, in Bavaria, Wurtenberg and Baden in 21 days, in Hesse and Prussia in 28 days, and in Austria in 30 days. _Diagnosis._ The veterinarian called to act as expert in such cases must examine the suspected animal along the different lines in which the cerebral aberration is manifested in the disease. He will see the animal standing quietly in the stall apart from all sources of excitement. See if there is a defect in the breadth of the cranium, or a deflection backward of this region from the straight line of the front of the face, together with a heavy clumsy head. Is the head pendent, resting on the manger, with dull eye, drooping lids, lack of expression, loose hanging lower lip? Does he hold morsels unchewed projecting from the mouth or over the tongue, or in the cheek? Does he plunge both mouth and nose in the water to drink, and masticate meanwhile? Are his legs found crossed or in abnormal positions, and if put in such positions, does he fail to rectify them at once? Is the head left in an abnormal flexed, depressed or lateral position if placed in it? Does the subject find it difficult or impossible to back? Does he pay the customary attention to the going or coming of other horses, to feeding, etc.?