Almost one hundred years ago Paul Langerhans (1) described the pancreatic islet cells. Another 50 years had passed before its physiological significance had become clear, following the studies of Laguesse (2). On the basis of histological observations, particularly referring to…

Vast areas of abandoned or sub-marginal land exist. In Quebec alone it has been estimated that there are about 1,400,000 acres of abandoned farmland (32). Some of this land is being turned into tree farms and more of it could…

Fundamental genetic studies have application in the breeding and improvement of crop plants. There is a deficiency of this knowledge in birdsfoot-trefoil (Lotus corniculatus L.). Cytogenetic principles have contributed a lot to the improvement of wheat, corn and several other…

A knowledge of the basic atmospheric parameters and their variability is required both for climatological purposes and theoretical studies. Meteorologists generally use constant pressure maps at a number of levels to study the broad scale structure of the atmosphere. Vertical…

Recently much information has accumulated indicating specific functions of inorganic ions, especially Na⁺ in the nutrition and metabolism of marine bacteria. A number of marine bacteria have been reported to have a specifie Na+ requirement for growth and for optimal…