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Far more significant were the fewer, larger mills cutting logs for export. Equipped with gang saws and ancillary machinery, they produced better lumber faster. After 1840 new technologies increased their size and efficiency. Circular saws were used for edging and trimming.

See CLIMATE CHANGE.

The OrganismThe organism that causes salmonella is a genus of bacteria of the family Enterobacteriaceae, members of which are commonly found in the intestinal tract of humans and other animals. It is named after D.E. Salmon, the American bacteriologist who described it in 1885.

How the world began is a question as old as the human race. It was not before the 20th century, however, that the evolution and large-scale structure of the universe emerged as a well-defined problem of interest to science.

After an unsuccessful attempt to form a research council in 1930, the Saskatchewan government established the Saskatchewan Research Council in 1947.

Scurvy is a disease caused by a dietary deficiency of vitamin C (ascorbic acid). The disease has occurred with regular frequency throughout human history and prehistory in populations lacking fresh foods, especially vegetables and meat.

Safety Standards, documents or codes which describe characteristics or usage for products, materials and services, are intended to protect citizens from the hazards of technology.

Interspecies gene transfer occurs naturally; interspecies hybrids produced by sexual means can lead to new species with genetic components of both pre-existing species. Interspecies hybridization played an important role in the development of domesticated plants.

In Canada's age of sail (1800-75) over 4000 ships, each exceeding 500 tons burthen, were built in Canada. In 1878 Canadian-registered ships numbered 7196 and totalled 1 333 015 tons. Among the nations, Canada stood fourth in seagoing tonnage.

The Transportation Association of Canada (TAC) is a non-profit association that provides a neutral forum for discussing technical issues related to road and highway infrastructure and urban transportation. It brings together governments, private companies, academic institutions and other organizations in Canada. The non-partisan association’s mission is “to work together to share ideas, build knowledge, promote best practices, foster leadership, and encourage bold transportation solutions.”

Canada's first highways were the rivers and lakes used by Indigenous people, travelling by canoe in summer and following the frozen waterways in winter. The water network was so practical that explorers, settlers and soldiers followed the example of the Indigenous peoples.

A river landform is a feature resulting from the movement of water on the Earth's surface.

Science Council of Canada, organization created by federal statute in 1966 to advise the government on science and technology policy. The original membership was 25 appointed scientists and senior federal civil servants, later altered to 30 appointed eminent experts from the natural and social sciences, business and finance, and no civil servants.

St Elmo's Fire is a blue or reddish glow, sometimes with the appearance of a flame, accompanying a powerful electrical discharge from a pointed conducting object in an intense electric field.

There are several phases to a contemporary Canadian medical education.

Sonar (sound navigation and ranging), method for locating objects by the reflection of sound waves. It is used naturally by such animals as BATS and DOLPHINS to locate food and obstacles.

Sand and gravel are unconsolidated, granular mineral materials produced by the natural disintegration of rock caused by weathering. The terms sand, gravel, clay and silt relate to grain size rather than composition. Sand is material passing through a number 4 (4.

Smoking is a universal health hazard. All forms of TOBACCO smoking are risky. Canadian consumption of cigarettes has been declining since the monitoring of smoking began in 1965, when an estimated 50% of adults smoked. In 1981 smoking prevalence had dropped below 40%.

J.A.D. MCCURDY was the principal designer and pilot; Glenn H. Curtiss developed the water-cooled engine, an advance on the association's earlier experiments.