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In this experiment the necks of the mice are cut open in the middle, so that the blood-vessels of the neck lie open and now some are contracted with loops.
A clamp is fixed temporarily at the inner artery of the neck so that the blood stream is stopped. After a cut into the other artery a tube is pushed forward to the brain, towards shut the middle cerebral artery. Some mice are infused a colouring substance into their hearts. A couple of minutes later they are decapitated. The brains are cut out and then examined.
In the case of some other mice the artery occlusion takes three hours. There some other special products are examined and a radio-active substance is infused into the belly.
The experiments are finished by the freezing of the mice. Then the brains are cut out and are examined.
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