. Popular science monthly. ol 10 would now stand for two, the symbol? 11 would stand for three, and so on. With the triadic system the placeswould be used exactly as in our decadic system. In the first placewould be the units, in the next place to the left the threes, the thirdplace to the left the nines, the fourth place the twenty-sevens, and so all numbers could be written in any of these systems. In startingwith a new system, one could begin to perform additions, subtractions,multiplications and divisions, as with the decadic system. The possi-bility of an endless range of experimen
. Popular science monthly. ol 10 would now stand for two, the symbol? 11 would stand for three, and so on. With the triadic system the placeswould be used exactly as in our decadic system. In the first placewould be the units, in the next place to the left the threes, the thirdplace to the left the nines, the fourth place the twenty-sevens, and so all numbers could be written in any of these systems. In startingwith a new system, one could begin to perform additions, subtractions,multiplications and divisions, as with the decadic system. The possi-bility of an endless range of experiments, with mature persons, who,while retaining all their present arithmetical knowledge, would be in-stantly reduced to the position of young children, so far as some ofthe computations were concerned, all this makes an inquiry into thepsychology of simple deductions of this type a very attractive wants to study psychology by becoming a little child has herea place for a wide range of study. £- <C // / / //. Sie Oliver Lodge, Principal of the University of Birmingham, president of theBritish Association for the Advancement of Science. THE PROGRESS OF SCIENCE 413 THE PEOGEESS OF SCIEXCE THE PEESIDEXTIAL ADDEESS BEFOEE THE EEITISH ASSOCIATION Great Britain is able to supply eachyear for the presidency of its nationalassociation for the advancement of sci-ence a scientific man of distinction, whocan deliver an address in a form inter-esting to a large audience and likely toattract popular attention. Sir OliverLodge, who presided over the Birming-ham meeting, was no exception. He isknown for his original investigationsin experimental physics and at the sametime for his wide-reaching address combined a statement ofrecent physical theories, likely to be ofinterest even to those who can not fullyunderstand them, with some remarks onvitalism and psychical research whichare sure to attract wide attention. Sir Oliver Lodge began his address,which extended t
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