BY H. S. HALCRO WARDLAW. 2S5 



In this table, too, it will be seen that the individual averages 

 do not differ greatly from one another, although the differences 

 shown are greater than in Table iii. The collective average 

 morning- and afternoon-temperatures, obtained from 100 observa- 

 tions distributed over four animals, are, in this case, 29*4** and 

 32'2''C., respectively, values slightly lower than those given in 

 the preceding Table, although the average temperature of the 

 air for this period was about 23^C., or 5" higher than in 

 the autumn-period. The differences from the average values 

 shown by single observations are rather greater than was the 

 case with the autumn-temperatures, differences of about 5° oc- 

 curring in a few cases. This may possibly be due, in part, to the 

 fact that the health of the animals examined in Spring and 

 Summer, with the exception of that of No. 6, was not so good as 

 that of those examined in Autumn. The former animals lived 

 only 1-3 weeks while under observation, whereas the latter lived 

 considerably longer, on the whole. It is to be noted, however, 

 that the variations in the temperature of Echidna No. 6, which 

 has survived all the others, were as great during the spring- 

 period as those of the animals which died. 



It has been seen that, outside of the winter-period, the morn- 

 ing-temperature of Echidna was almost invariably lower than 

 the afternoon-temperature; the average difference for the whole 

 of the observations was 2'8°C., but there were considerable varia- 

 tions from this value. It will be seen, too, that, in the great 

 majority of cases, the external temperature was also higher in 

 the morning than in the afternoon. In spite of this general 

 agreement in the direction of the changes of the temperature of 

 the air and that of the changes of the temperature of the animals, 

 the grounds do not seem sufficient for concluding immediately 

 that the variations in the temperature of the animal are due to 

 those of the temperature of the air. In the first place, there 

 were several instances in which the temperatures of the air in 

 the morning were greater than in the afternoon, and yet the 

 temperatures of the animals increased towards the afternoon in 

 the usual way. These instances are collected together in the 

 folio wince Table. 



