162 



ROYAL SOCIETY OF CANADA 



less and inverts several times. The departure of the trace towards 

 the positive commenced a little after noon and showed that warmer 

 conditions were likely to follow. From the character and extent 

 of the warmer waves lasting so long we predicted at once a decided 

 change to warmer weather, although the temperature at the Ob- 

 servatory was still falling. This change actually took place at noon 

 on the 6th, when the temperature rose steadily until the early morning 

 of the 7th, when the snow and rain predicted for the night previous, 

 arrived. The early part of the record, before 6 p.m. on March 4th-5th, 

 is not given on account of the effect of the sun during the day on the 

 cable head box as described. 



We must still further emphasize the value of these temperature 

 records for local temperature predictions. A host of examples could. 

 be presented if space permitted, showing the accuracy of our records, 

 but we believe that the examples cited will be sufficient. It is very 

 much desired that more stations be established elsewhere for similar 

 observations, in order fully to develop this method. 



We desire to thank Mr. C. H. Hood for assistance in reducing 

 observations and in taking care of our thermograph when in place 

 on the tower. 



M/\RCH, ^. AND s 



+ 2^ 



-2^ 



O'CLOCK 



