In the Hackensack meadows of New Jersey, previously famed for their mosquitoes, there has been found a natural calendar record of the retreat of the last great ice sheet that covered American not less than 20,000 years ago.
The clays that form the meadows tell a graphic story of the northward retreat of the ice.
Disease-causing bacteria have many devices to perpetuate their kind in an adverse world. Bacteriologists of the Hooper Foundation for Medical Research, University of California, have shown that tetanus spores may resist the temperature of boiling water for 90 minutes, botulinus in vegetable juices for five and one-half hours and those of a closely related but harmless species for eight and one-half hours. Other workers have proved that typhoid and other organisms may remain alive for years at refrigerator or lower temperatures.
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