Remarks on Mr. Sprague's Suggestion

Ecological Studies of Sessile Rotatoria, Part II: Dynamics of Populations and Social Structures

“…The age is given as per cent deviation from the mean length of life which is taken as 100o/o. Pearl & Doering (1923) to have an lx curve which approached closely to the extreme rectangular type, but Figure 26 shows that Lecane inermis approaches even more closely to this theoretical type where the animals all live to the same age, then die simultaneously. According to the data presented in Table 6 by Ferris (1932), Epiphanes senta also has a more rectangular lx curve than does Proales decipiens, but slightly less so than Lecane inermis.…”

Environmental Relations of Michigan Ectoprocta, and Dynamics of Natural Populations of Plumatella repens

“…Pearl and Doering ( 1923) prepared a survivorship curve for the rotifer Proales decipiens, which is a nearly rectangular curve. Pearl and Doering ( 1923) prepared a survivorship curve for the rotifer Proales decipiens, which is a nearly rectangular curve.…”

Duration of Life as an Index of Constitutional Fitness

“…In the period since I was compelled by force of circumstances to give up my own studies in the genetics of poultry in 1917, most of my time has been devoted to the investigation of one of the most fundamental attributes or characteristics of the living organism, namely the duration of its life, and the factors concerned in the determination of this duration (cf., Pearl et al, [1][2][3][4][5][6][7][8][9][10][11][12]. In the course of these studies certain facts have emerged, and certain concepts have developed, which I think may possibly have some bearing upon the problems of animal br-eeding in general, and poultry breeding in particular.…”

“…My motives in doing so were in part selfish; I hoped that possibly I might succeed in interesting some of you sufficiently to bring it about that you would collect some adequate data on the normal duration of life of poultry. When it is pointed out that there now exist, so far as I am aware, the data necessary for the construction of complete life tables for but two organisms besides man (with enough from two others 10,000 (10,000-a) (10,000-a)-b etc.…”