. Manuel de l'agriculteur canadien de l'agriculture [microforme] : les principes et la pratique de l'élevage mixte adaptée aux sols et climat : comprenant : le terrain ; produits de la ferme ; l'élevage et de gestion ; la ferme ; les produits laitiers ; les maladies des chevaux, bovins, ovins, porcins, bâtiments agricoles, des machines modernes et des outils : l'avocat de l'immigré-colon, etc.. L'agriculture ; les exploitations agricoles exploitations agricoles ; l'Agriculture ;. Manuel de l'Agriculture. 49. que les effets négatifs de l'eloetricity un nuage une sont recueillies vers le point a, et l'électricité positive du nuage b i

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. The Canadian farmer's manual of agriculture [microform] : the principles and practice of mixed husbandry as adapted to Canadian soils and climate : comprising: the field; produce of the farm; stock raising and management; manufactures of the farm; dairy; diseases of horses, cattle, sheep, pigs; farm buildings, modern machinery and implements : counsel to the immigrant-settler, etc.. Agriculture; Farms; Agriculture; Exploitations agricoles. Manual of Agriculture. 49. that the negative eloetricity of the one cloud a is gathered towards the point a, and the positive electricity of the cloud b is gathered towards the point b. Then when a and 6 come within a certain distance of one another, the attraction of the opposite poles of electricity, mutually the one to the other, becomes so great, that they rush to unitewith great rapidity through the intervening space. The union is attended with combustion, which is the Jidsk of lightning, while the sound of such combustion is the thunder. We will now take as one illustration the cloud and the barn, and before doing so, point out Fm. lo. another very important fact _ , ^ with regard to the escape of electricity from bodies : i.e., that electricity in any body will invariably gather to a point, and will escape first from that jjoint. This is very important, as upon it rests the entire principle of the use of the lightning rod. Supposing, as in the annexed diagram, there is a point a iu the cloud, to which is gather- ed the positive electricity of ihe cloud : the barn b charged with an opposite or negative elec- tricity : the affinity of the electricity respectively contained in the barn and in the cloud is so fio. 17. great that, should the cloud he driven within a certain distance of the barn, their severally contained electri- cities wi'' burst all bonds asunder, and, rushing with prodigious force to 1 eet one anotli r, w^ill evolve such heat as will, in all proba- bility, St the barn on fire. Weno consider the exact use an

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