THrS technologic paper is published in order to aid the paperbag manufacturers to meet the requirements of the lime and cement manufacturers in obtaining a suitable paper bag in which to ship their product. It contains information relating to the methods of testing and the apparatus employed in determining the quality of paper bags for lime and cement. For this purpose representative samples of paper bags are obtained from a number of the leading bag manufacturers. These bags are given identification numbers and the following tests are performed. These tests are divided into two classes, namely, ordinary and special tests. The first class includes all tests that are ordinarily performed on paper, such as weight in pounds of the standard size ream 25 x 40--500, bursting strength in points, tensile strength in kilograms, stretch in centimetres, folding endurance in number of double folds, percentage of fibre composition, percentage of ash and percentage of rosin sizing. The second class includes certain tests that are specially appropriate for paper bags. There are three distinct tests in this class. The first is a laboratory test performed on a recording instrument and gives numerically the stresses and strains that the paper of these bags undergoes in service. This test is called a resiliency or endurance test. The second is a service test and determines the breaking strength of the paper when the bags are filled with 94 pounds of sand and dropped a distance of three feet. This test is called a drop test, and its purpose is to reproduce service conditions since a bag is often dropped while being handled. A comparison is made of the results of the drop test with the results of the above resiliency test and the same papers prove strongest in both cases. It is thus proven that the resiliency test is a very good test for showing what the paper of a bag will do in actual service, and since it is strictly a laboratory test, it is highly to be recommended. The third is also a service test and determines the strength of the adhesives used in the bags ; the bags are filled with 0.4 pounds of sand and jolted one inch hi~'h on an ordinary foundry ' Technologic Paper No. 187.