1865.] Physiology. 181 



artery the lymph vessels are compressed, and their contents propelled 

 towards the heart. 



Dr. E. Crisp gave an account of the mammalia in the abdominal 

 veins of which he had observed the presence of valves. He also read 

 a paper " On the Size of the Blood Corpuscles in relation to the Size 

 of the Animal, its Organization and Powers of Endurance," the object 

 of which was to show that the opinion generally entertained that the 

 largest animals in the same family had the largest blood globules, was 

 erroneous in many instances. 



Mr. R. Garner described a small organ situated at the base of the 

 middle pair of legs of Corixa, an abuatic insect, by the passage of air 

 through which he supposed the characteristic sound produced by the 

 insect was occasioned. 



Mr. J. T. Dickson read a paper " On Cell Theories," in which he 

 argued against the formation of cells out of inorganic matter, on the 

 theory of manufacture of Mr. Eainey. He then offered a cell theory 

 in which he assumed life to be an essential element, existing in the 

 molecules, of which a homogeneous mass is composed, the molecules 

 aggregating to form nuclei, from which cells are developed. 



An account of the composition and uses of the horse-chestnut was 

 given by Dr. John Davy. His examination comprised the nut, leaves, 

 wood, pith, and bark of this tree, and he concluded that it deserved 

 more attention in an economic point of view than it had yet received. 



