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06 - Difficutiles in Theory 06-01 - Difficulties on the Theory of Descent with Modification 10 Long before having arrived at this part of my work, a crowd of difficulties will have occurred to the reader. Some of them are so grave that to this day I can never reflect on them without being staggered; but, to the best of my judgment, the greater number are only apparent, and those that are real are not, I think, fatal to my theory.

These difficulties and objections may be classed under the following heads:-Firstly, why, if species have descended from other species by insensibly fine gradations, do we not everywhere see innumerable transitional forms? Why is not all nature in confusion instead of the species being, as we see them, well defined?
06 - Difficutiles in Theory 06-01 - Difficulties on the Theory of Descent with Modification 20 Secondly, is it possible that an animal having, for instance, the structure and habits of a bat, could have been formed by the modification of some animal with wholly different habits? Can we believe that natural selection could produce, on the one hand, organs of trifling importance, such as the tail of a giraffe, which serves as a fly-flapper, and, on the other hand, organs of such wonderful structure, as the eye, of which we hardly as yet fully understand the inimitable perfection?
06 - Difficutiles in Theory 06-01 - Difficulties on the Theory of Descent with Modification 30 Thirdly, can instincts be acquired and modified through natural selection? What shall we say to so marvellous an instinct as that which leads the bee to make cells, which have practically anticipated the discoveries of profound mathematicians?
06 - Difficutiles in Theory 06-01 - Difficulties on the Theory of Descent with Modification 40 Fourthly, how can we account for species, when crossed, being sterile and producing sterile offspring, whereas, when varieties are crossed, their fertility is unimpaired?
06 - Difficutiles in Theory 06-01 - Difficulties on the Theory of Descent with Modification 50 The two first heads shall be here discussed.
Instinct and Hybridism in separate chapters.