Abstract
T HE first complete life tables based upon comprehensive and accurate observations for any other organism than man, were, so far as we know, those published in the first of this series of Studies by Pearl and Parker (30) in i91i for normal wild-type Drosophila melanogaster, and for its mutant vestigial. Since that time partial or complete life tables for Drosophila have been published by Pearl and Parker (3i) for line-bred strains; (32.) showing effect of successive etherizations; (33) demonstrating influence of density of population on duration of life; (34) influence of ventilation and of feeding embryonic juice; (35) re-computed life tables; (36) for duration of life in the complete absence of food. Pearl, Parker and Gonzalez (37) have published life tables on the Mendelian inheritance of duration of life in Drosophila, and on the effect of surgically removing the wings upon duration of life. Gonzalez (iL) computed Drosophila life tables showing the relation of certain mutant genes to duration of life; Pearl, Miner and Parker (29) on the effect of density of population; Alpatov and Pearl (X) on the effect of temperature; Alpatov (i) on the effects of feeding; and Steinfeld (43) on the effects of a sterile environment. For other non-human forms the following life tables have been published: for the saturniid moth Telea polyphemus a graph of the ungraduated survivorship line by Pearl and Parker (35) based on data published by Philip and N. Rau (40); for the rotifer Proales decipiens by Pearl and Doering (26) based on data published by Noyes (i9); and for mice by Greenwood (I4) based on data from Leonard Hill and J. A. Murray. Data on life duration without the computation of life tables have also been given by Hase (i6) for the common Hydra fusca; by Rau (39) for the roach Blatta orientalis; and by the Szabos (45) for the slug Agriolimax agrestis. Recently Gardner and Hurst have published life tables for the domestic fowl (io). Certain of these data, not previously graduated, have been fitted with the following equations:
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