MS in one of the laboratories of the Freshwater Institute in Winnipeg, of a technician at work on X-ray machine. CSs of the machine, of a graph and of a digital counter. Several shots from different angles of Dr McRae working with a microscope examining worms, of another technician, Margaret Hagen, working with microscope too, encasing permanently the sected parts of tiny organisms and classifying them for microscopic studies. ECSs of the drops under microscope. Shots of the technician at work placing classified organisms into cupboards. Shots of another technician looking through microscope and drawing microscopic organisms he sees. Various shots from different angles of a technician doing diverse lab operations, smoke bellowing from cylinders.