Trachea Diffusion of oxygen and carbon dioxide takes place across the walls of the smallest tubes, called tracheoles, which penetrate tissues and even indent individual cells. Gas may be conducted through the respiratory system by means of active ventilation or passive diffusion. Unlike vertebrates, insects do not generally carry oxygen in their haemolymph. This is one of the factors that may limit their size. A tracheal tube may contain ridge-like circumferential rings of taenidia in various geometries such as loops or helices. Taenidia provide strength and flexibility to the trachea. In the head, thorax, or abdomen, tracheae may also be connected
Ye Jacobites by Name a collection of Scottish songs entitled "Personal Choice" by Ewan MacColl. The tune is taken from "My Love's in Germany" by Hector Macneill. This is the version in Johnson's, Hogg's and MacColl's collections: <poem> Ye Jacobites by name, give an ear, give an ear, Ye Jacobites by name, give an ear, Ye Jacobites by name, Your fautes I will proclaim, Your doctrines I maun blame, you shall hear, you shall hear Your doctrines I maun blame, you shall hear. What is Right, and What is Wrang, by the law, by the law? What is Right and what is Wrang by