by h. s. halceo wardlaw. 849 



Summary. 



The iiiufit piubablc tcinpcraturt's of Echidna are: in the morn- 

 ing, 29 TX'. during autunni and winter; 300'C. during spring 

 and summer. In the afternoon, 32-3°C. during autunni and 

 winter; 32'6°C. during spring and summer. 



The temperature-regulating meclianism of Echiihia is only 

 ertecti\e wliile the body-temperature lies betweeji •27'6°C, and 

 32 fi"!/. Outside of these limits, Echidna behaves as a poikilo- 

 ihermal animal. 



KEFERENCE.S. 

 (iALTON. — Natural Inheritance. London. 1880. 

 Wakdlaw.— Pioc. Linn. Sou. N. 8. Wales, 19L3, xl., p.231, 

 Ibid., 1917, xlii.. p.Slo. 



LEGENDS OF TEXT-FK^UKES. 



Text-%.1 (p. 845). 

 Kolalixc frequency of (occurrence of ditFerent autunni and w inter temper- 

 atures of Echidna. Ahscissie, Ijodj'-teinperatiu-es of Echidna. 

 Ordinates of curves A and !^ are proportional to inu!d)ers of ob- 

 servations at and below the corresponding temperatures. Ordinates 

 of curves A' and B' are proportional to numbers of observations at 

 the corresponding temperatures. The points joined by the lines A " 

 and B" indicate the average air-temperatures corresponding to each 

 degree range of body-temperature. Letters A, A', A" refer to 

 morning-temperatures; letteis B, B', J5" to afternoon-temperatures. 



Text-tig. 2 (p 847). 

 Rclalivc f'requenc,y of occurrence of different spring and summer temper- 

 atures of Echidna. Abscissje, body-temperatures of Echidna. 

 Ordinates of curves C and IJ are proportional to numbers of ob- 

 servations at and below corresponding temperatures. Ordinates of 

 curves C and D' are proportional to numbers of ol)servations oc- 

 curring at the corresponding temperatui-es. The points joined by 

 the lines C" and D" indicate the average air-temperatures corres- 

 ponding to each degree range of body-temperature. T-ietters C, C", 

 C" refer to morning-temperatures: letters 1), D', D" to afternoon- 

 temperatures. 



