Slide showing four pie-charts of 'shift in the composition of subpopulation groups by unequal reproduction of the individual groups' [translated from German]. Slide shows four black and white pie-charts of 'shift in the composition of subpopulation groups by unequal reproduction of the individual groups' [translated from German]. The description under the title reads: 'There are two subpopulation groups equal in size, the one (A) 10 births annually, the other (B) twenty births, and both have 15 deathtraps out of 1000 inhabitants, therefore take the B group from total of A ever more rapid measure.' Under pie charts title reads 'After approximately 40 years A from B have fully penetrated'. The whole chart is written in German, our translations are only approximate. Late 19th - early 20th century