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¡¡¡¡2.The scientific worker attempts to formulate these problems in accurate terms and to solve¡¡them in the light of all the relevant facts that can be collected by observation and experiment.

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¡¡¡¡4.The unit of heat on the c.g.s.system is the calorie£¬which is established as the amount of¡¡heat required to raise one gramme of water by one degree centigrade.

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¡¡¡¡8.One suggestion has been the use of mixtures of two different types of insecticide£¬with the idea that one of them should eliminate the individuals resistant to the other.

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