Full resolution (JPEG) - On this page / på denna sida - Sidor ...
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
„The ratios for BROOKS’s law come out sufficiently clearly, although the total numbers
are small, and in spite of the difficulty of separating this species from magna at the lower stages.
Taking the means as a basis for calculating:
? 1.07 X 1,48 = 1,58; 1,58 X 1.48 = 2,33.
ö 0,77 X 1,40 = 1.078; 1,08 X 1,40 = 1.51; 1,50 X 1,40 = 2,10“ (1,51 X 1,40 = 2,11),
(p. 206).
Conchoecia rhynchena G. W. Müller.
Stage II. Mean 2,47. Stage III. Mean 1,60. Stage Mean 1 IV. .04. Stage V.j Mean 0,70.
Length in mm.: Number oi’ S measured: 2,6 2 2,5 2,4 8 2 2,3 1,7 1,6 1,5 1.1 12 13 I 1.0 1 0,9 1 0,8 0,7 0.6 2 1 2
Total specimens measured: 28 Ç.
„In the females the reaction to a growth-factor is very close: —0,7 x 1,54 = 1,07:
1.04 X 1,54 = 1,60; 1,60 X 1,54 = 2,46. As there are only three males to represent Stages Til.
and IV., it is useless to discuss their growth-factor.“ (p. 272).
Conchoecia imbricata (G. S. Brady).
Stage II. Stage III. Stage IV. Stage Y.
Meart 2.34 Mean 1,50 Mean’0,96 Mean 0,66
Number oï $ measured: 3 7 12 1 1 2 17 2 11 6 1 O 1
Length in mm.: 2,5 2,4 2,3 2.2 i 2,1 2,0 1.9 1,8 1,7 1.6 1.5 1,4 1,3 1.2 1,1 1.0 0,9 I 0.8 0,7 11.6
Number ol measured: 2 5 1 1 1 5 14 1
Stage IL Stage III. Stage IV.
Mean 2.01 Mean 1.48 Mean l,0
Total specimens measured: 65 $ + 36 <J.
„Now, taking the mean lengths of the females at the different stages: — 0,62 x 1,56 =
0.96; 0,96 x 1,56 - 1,497; 1,50 x 1,56 = 2,34 .... The males are mucli fewer and
there-fore respond less accurately: — 1.0 x 1,45 = 1,4; 1,4 x 1.45 = 2,03.“ (pag. 225).
Conchoecia daphnoides C. Claus.
Stage m.
Møcin 3.08. Mean 1,2.
Length in mm. : 3,5 3.4 3,3 3.2 3,1 3.0 2,9 2.8 2,7 2,6 1,2
Number of ? measured : 1 i 5 W 15 31 9 5 2 1 1
Total specimens measured: 112 Ç.
„In addition to the numerous specimens of Stage I. there was a single female specimen
of (apparently) Stage III.; this with the aid of a slide-rule enables one to make an empiric
guess at the mean of Stage II. With a growth-factor of 1,6 for females it appears that 1,2 x
1,6= 1,92; 1,92 x 1,6 = 3,07; and we may fairly présumé that the mean of Stage II. will
be a little more or less than 1,9“ (p. 263).
<< prev. page << föreg. sida << >> nästa sida >> next page >>
