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STATISTICS show clearly that, while the quantity of synthetic is increasing at a satisfactory rate, the stockpile of natural rubber is already dangerously low, with little hope of improvement very soon. Less than 10% of the natural rubber that we actually need is being imported into the country. It is necessary, therefore, that truck and bus operators learn the limitations of the synthetic tires that they will continue to get, and which will contain increasing percentages of synthetic. To aid the operators in giving these tires the care they need for maximum life and repeated retreadings, Mr. Hale gives here a short manual of dos and don'ts for the proper care of synthetic tires.

LENGTHY consideration is given to tire overloading, with the understanding that overloading as referred to in tire failures is quite different from the application of the term overload to structural materials which collapse under a reasonably well-defined excess of load. While this paper deals primarily with overloading, there are so many other aspects relating to the use of truck-bus tires affecting the industry that a discussion is included of various other phases of the tire business intended to be instructive along the line of longer life and greater freedom from trouble. The increasing varieties of service in which motor-vehicles are being placed demand different types and characteristics of tires, which are outlined. Then there is a discussion of the relative merits of the balloon type versus high-pressure-type tires.