. Agriculture intensive et utilisation de la dynamite . fait à l'aide d'une hache, avec l'avantage de l'opérateur étant à une distance de sécurité lorsque la confiture commence. BRISER les chemins de ROULEMENT quarante pour cent, la dynamite peut être utilisée à grand avantage incassant les rollways de billes, de grandes quantités de ce powerfulexplosives étant utilisées chaque saison par les bûcherons. Un cas de cet explosif, décongelé le matin, sera, s'il est recouvert d'une couche d'or ou d'une couverture et protégé du froid, prêt à l'emploi à tout moment de la journée. Les énormes piles de billes, gelées et débordés de neige et de glace, peuvent être instantanément décollées avec un

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. Intensive farming and use of dynamite . done with an axe, with the advantageof the operator being at a safe distance when the jam starts. BREAKING UP *ROLL WAYS Forty per cent, dynamite can be used to great advantage inbreaking up rollways of logs, large quantities of this powerfulexplosive being used each season by the lumbermen. A case ofthis explosive, thawed in the morning, will, if covered by an oldcoat or blanket and protected from the cold, be ready for use atany time during that day. The huge piles of logs, frozen and boundtogether with snow and ice, can be instantly loosened with a littledynamite instead of prying them apart slowly and laboriously withcant hooks and levers. At a season when time is truly money, the dynamite used in this way saves many times its cost. The casesof dynamite can be transported easily and safely if properlyhandled. No logging camp can afford to be without it a single daywhen engaged in this work. 82 EXPLOSIVES ANDBLASTING SUPPLIES HOW TO HANDLE, STOREAND USE THEM BLASTING BY ELECTRICITY. PRINCIPLE OF EXPLOSIVES BLASTING Explosives are divided into two general classes, known as high explosives and low explosives; dynamite andlow powder are examples of the former, and blasting powderof the latter. They are solids, having bound up in themselves verypowerful energy, which, when properly directed, can be made todo an enormous amount of valuable work. To get them to do thiswork economically, they must be closely confined in the midst ofthe material which is to be broken or thrown out, and then exploded;that is, instantly changed from a small volume of a solid to a verjlarge volume of a gas. Low explosives (blasting powder) will dobut little, if any work, if not tightly confined or corked up whenexploded, but high explosives change from a solid to a gas soquickly that they will jar and break material on which they arelying when they explode, even though they are confined very little, as in **mudcapping or blistering boulders, or if not

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