Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
flected from the paper at the time of the observation was, in
foot-candles, that represented by the figure.
1:50 P.M. Light about 900, Term T in sun but not "open". I.e.:
not sunning hisir backs with spread wings and wing coverts,
Archie in shade. Temp. 66 (Degrees Fahrenheit).
2:07. Lt. 850, Temp. 69 (Not really rising, but time lag of inst.).
Archie in sun, facing it, wings slightly drooped. T in shade
partly "open".
2:10 Lt. 850, Temp. 70. A opens up, back to sun. T as before.
2:12 " " " " A moves so that shade is on back and
sun is on breast and closes up. No change in T.
2:14 Lt. 900, Temp. 75. A moves into complete shade and opens up.
Terry comes into full sun, opens up for.
about 20 sec., moves into shade and breeze
2:17 " " " " Both restless, moving about from sun to
shade and seeming to prefer partial shade,
neither open.
2:21 Same conditions. Terry begins to rattle-boo. Both run
about quietly seeking some place different
than the one they are in and have short
and frequent open periods of the order
of 10 sec, after which they seek shade.
Seen unable tolerate direct sun longer.
2:37 Lt.1000, (I.e. the limit of the scale has been reached). Temp.
72. In and out of light and shade. Opening
up a few seconds as they come out of
shade. Not particular about placing their
back squarely to sun. May be side to it.
Archie shows signs of resorting to the
spread-eagle, or hot weather posture.
2:43 Lt.1000, Temp.70. Neither sunning, preferring shade and
now concerned about food.
2:45. Same conditions. Both showing partiality for partial shade
and opening up there.
2:46. " " Archie makes T move on.
3:00 Lt. 900, Temp.72. Under these conditions light measured from
Terry:
Wing...90
Back 100 when covered by wings.
" 65 when open.
Both preferring partial shade.
(Temperature under oak in court in complete shade at this time:60.
Although thermometers not checked with each other under identical
conditions, this difference probably about right owing to dif-
ferent exposure of the two points).
3:20 Lt. 1000. Blue sky at zenith 100
Sleeve of gray coat 70
Light gray hat 200