RICHARDS. THE ELIMINATION OP THERMOMETRY LAO. 19 



2. It is shown that the lag of the thermometer behind the tempera- 

 ture of even a slightly cooling or warming environment causes an appre- 

 ciable error in estimating the temperature of the environment. 



3. It is further shown that this lag may be easily determined and a 

 suitable correction applied. 



4. A new method for entirely obviating this and all other corrections 

 for cooling in calorimetric work is shown to consist in systematically 

 altering the temperature of the environment at the same rate and to the 

 same degree as that of the calorimeter proper. 



5. This method is shown in several series of experiments to give a 

 more constant result than the old method of calculation. 



6. It is shown, moreover, to give essentially the same value for an 

 adiabatic rise of temperature as that afforded by the old method when 

 the latter is further corrected for the lag of the thermometer. 



7. Therefore it appears probable that the true result of a calorimetric 

 experiment can be attained only with the help of one or the other of 

 these new methods, or some such method as that suggested by Richards 

 and Lamb. 



