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XIV MOVING PICTURES OF MICROBES 167 In the early part of the film the parasites are few in number; they are seen to dart to and fro among the blood cells with striking vigour and rapidity, jostling the corpuscles violently in all directions, and causing them to bounce against one another like india-rubber balls. As the film advances, showing the progress of the disease, the parasites are to be seen increasing rapidly in number. At last they appear to overwhelm the blood corpuscles, this multiplication continuing until death supervenes some four or five days after injection. The film was shown lately before a gathering of medical men, and created wide- spread interest, as it introduced them to a phase in the life of the parasite which hitherto had been beyond their comprehension. Another film shows the "phenomenon of agglutination." The white cells of the blood act as the policemen of the stream and maintain a vigilant outlook for criminals in the form of parasites. When the microbe offenders come within the strong arms, or embrace, of this guardian, either they are seized, or serum substances are thrown out by the white corpuscles, which agglutinate, kill, and dissolve these enemies. The film shows the blood of a fowl infected with spiro- chsetes. In the first instance, the microbes are to be seen swimming about actively in the plasma—the liquid in which the red and white corpuscles are held. The bird is recovering from the malady; one sees the white cells engaged in their task of restoring law and order in the blood stream. The spirochsetes commence to congregate, become sluggish in their movements, forming first strings, and then star-shaped groups. The white cell appears on the scene, and these enemies gather round him in a dense clump. The policeman grasps them in a sticky embrace from which they cannot escape, and in a short time all the spirochsetes have joined one or other of the gatherings about a policeman. The latter continues to throw out the agglutinate, which locks the enemies as tightly together as if they were handcuffed. At first they wriggle and endeavour to escape, but the white blood cell is too power-