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the unaided eye, although the microscope will exhibit them in masses. Owing to the serious losses which occur among calves and lambs, and occasionally among adult cattle and sheep, from the ravages of strongles, stockowners have for many years past been anxiously asking for information as to the causes of the disease and the best means of cure and prevention, hitherto without much success. Causes may be summed up in a few sentences. The embryos which are, or for years have been, distributed over pastures in which cattle and sheep have been grazed retain their vitality for a long period, even under extreme con- ditions of climate. In wet seasons they flourish, and it is always observed that the occurrence of rain at almost any period of the summer and autumn is followed by outbreaks of husk. Some pastures which are low and wet are dangerous at all times during the grazing season. Prevention of the disease implies removal from the pastures when the embryos of strongles are likely to be present ; but this is in many cases an impossible remedy, there being no feeding grounds on the farm free from them. Perhaps top dressings of salt might be beneficial in one way, but it is to be feared that the use of that agent in sufficient quantity to kill the embyro worms would be very prejudicial to the herbage. The regular use of trough food, mixed with salt, for young animals on such pastures, would be quite free from any danger, and is certainly worth a trial. One more important preventive measure is commonly neglected, because it does not seem to have any direct relation to the disease ; but experience has shown that in all maladies which end in exhaustion liberal rations are most essential. A full allowance of nutritious food does not, it is true, prevent the entrance of young strongles into the bronchial tubes of the young cattle or sheep ; but it has the effect of keeping the infested animals in good condition,