File:American journal of physiology (1898) (14781764945).jpg

Identifier: americanjourna06ameruoft (find matches)
Title: American journal of physiology
Year: 1898 (1890s)
Authors: American Physiological Society (1887- ) American Physiological Society (1887- ). Abstracts of papers presented at the fall meeting American Physiological Society (1887- ). Proceedings
Subjects: Physiology Physiology
Publisher: (Bethesda, Md., etc.) American Physiological Society (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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des animaux etdes plantes. Trad, de Senebier, p. 188. ^ Loc. cit., p. 121. ^ Loc. cit. ^ Loc. cit., p. 129. I* Loc. cit. Part II, p. 459. Loc. cit., p. 1(8. 1^ Loc. cit. * Loc. cit., p. 128. Physiological Zero for Ike Egg of the Domestic Fowl. 389After working over Feres data, I get the results tabulated below. Temperature .... 34° 35° 36° 37° 38° 39° 40° 41° Index of development . 0.65 0.77 0.71 0.61 (1.00) 1.11 0.75 1.50 Number of embryos (with age given . . \ 29 37 53 25 37 9 21 The differences in my table are mainly due to employing the fullnumber of cases given by Fere and the addition of the index for 37°.If the objection given above in Davenports foot-note should hold for37° it could be urged with even greater force for 40° and 41° andalmost as much for 34°. In Series A, B, C, and D I have carried the index of developmentfrom 30.75° to the physiological zero, 20°-2i° and present the resultsthere found in the following graphic form. PERCENTAGEOF NORMALDEVELOPMENT
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390 Charles Lincoln Edwards. The break between Curves A and B represents a complete changein apparatus and environment from Cincinnati to Hartford. How-ever, this gap is not of great importance since it involves merely thenumber of blastoderms with embryos of the same general development. PERGEiNTAQE OrMOR/nAL DEVELOPnE/ST lOr I I I I I—I rr I I I TrH* I I i-i L PERGE/STAQE Or/SORnAL DEVELOPnEMT 20 22 SERIES B ANDC 24 Temperaturc ^u ,, ■ ■ ■■ ■ - Tip Fæ (talk)^~. 1 ^_ _ T 1 ■ --hr --1- 1 1 1 ^« j.. 1^ I ^ ^ _ZL. ii. ^^^1 i: j Q __ __ _ ___ ^^^ ( ^ ^ ^x ;^* :: ■^.. .. _,,. ■^ ^ ^■^ _ _j_ JT. ■ jp It _^. ;x 0 ^ ^ =i±=^-::==s-¥^^^ --=== . p - L_T 20 22 24 2^ 2 Temperatube SERIES D The last incubation of Curve A is 3 per cent less than the first ofCurve B and C, but in both, the ontogenetic stage, that of the fullydeveloped simple primitive streak, is practically the same. In CurveD, representing the incubations of Series D, I have given a contin-uous index of developme

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