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gives unrivalled opportunities for investigation. I have recorded the results of several persons' observations for the last twelve years ; the observations of one, viz. : Angus McKay, senior, go back for above fifty years. We must confess being occasionally reduced to the mental state of the cautious witness, who answered " I don't know," till counsel said " Tell us something you do know." " I know as Miller's pigs is always fat," was the reply, but doubt returned like a flash as he added " I dun'no know whose corn they'n eaten." Let us hope this paper may arouse observation, and stimulate inquiry in other districts. H. E. Jura, N.B., November, 1890. PARASITIC DISEASES OF FARM ANIMALS. [From the "Field" 1890, by permission.'] ROUND WORMS (Nemathelminths) have a history which, as was staled in the last article, is less clearly defined than that of the cystic or trematode worms. In all the round worms the sexes are separate individuals, and the females possess a long coiled uterus, in which are contained an immense number of eggs, which, when they are extracted from the oviduct, have the living embryo within the yet unbroken shell. When the embryo emerges from the egg, its organism is extremely simple. A miniature representation of the parent worm in outline, its interior is filled with granular matter, from which the digestive and sexual organs will be formed ; and there is a narrow mouth, by means of which the young parasite