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A study of the tracheation of nine tissues and organs of five species of insects reveals that the arrangement of tracheae and especially of tracheoles is determined by the structure of the tissue supplied. Adaptations are found in the ovary permitting the supply of the oocyte during its rapid enlargement. There is a correlation between the abundance of the tracheal supply of a tissue and its probable oxygen requirements.

Studies on the Digestion of Wool by Insects III. A Comparison Between the Tracheation of the Midgut of Tineola Larvae and That of Other Insect Tissues