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 the reproductive products with the uncertainty of fertilization has more and more been replaced by a controlled impregnation and an effective protection of the offspring. In this way part of the energy required in the production of eggs and sperma has been transposed into the creation of mechanisms for allurement and for protection of the young. Thus we discover the first instincts of art in animals used in the service of the impulse of creation, and limited to the breeding season. The original sexual character of these biological institutions became lost in their organic fixation and functional independence. Even if there can be no doubt about the sexual origin of music, still it would be a poor, unæsthetic generalization if one were to include music in the category of sexuality. A similar nomenclature would then lead us to classify the cathedral of Cologne as mineralogy because it is built of stones. It can be a surprise only to those to whom the history of evolution is unknown to find how few things there really are in human life which cannot be reduced in the last analysis to the instinct of procreation. It includes very nearly everything, I think, which is beloved and dear to us. We spoke just now of libido as the creative impulse and at the same time we allied ourselves with the conception which opposes libido to hunger in the same way that the instinct of the preservation of the species is opposed to the instinct of self-preservation. In nature, this artificial distinction does not exist. Here we see only a continuous life impulse, a will to live which will attain the creation of the whole species through the preservation of the individual. Thus far this conception coincides with