146 



MR. T. MACKERETH ON SOLAR RADIATION. 



have a projection very similar to the one presented by 

 Mr. Baxendell on page 38, vol. vii., of the ^ Proceedings ; ^ 

 and I have no doubt that if the observations had extended 

 over a longer period, the similarity would have been more 

 striking. 



Below I present my monthly means as they have been 

 reduced. 



Year. 



January. 



February. 



March. 























Max. 



bk. bulb 



Max. in 

 shade. 



Diff. 



Max. 

 bk. bulb 



Max. in 

 shade. 



Diff. 



Max. 

 bk. bulb 



Max. in 

 shade. 



Diff. 





m sun. 







m sun. 







in sun. 













































1862. 



48-0 



42-5 



5*5 



52-7 



45-4 



7-3 



55-1 



46-7 



8-4 



1863. 



49-8 



44' 3 



5-5 



55-5 



47-4 



8-1 



62-4 



49-9 



12-5 



1864. 



44"9 



40-0 



4*9 



50-5 



40-4 



lo-i 



57-8 



45-6 



122 



1865. 



44-6 



40-3 



4-3 



44-8 



40-0 



4-8 



51-8 



42-1 



9-7 



1866. 



49*9 



467 



3*2 



52-1 



45-0 



7-1 



54*4 



44-9 



9-5 



Means 



47*44 



4276 



4-68 



51*12 



43-64 



7-48 



56-30 



45-84 



10-46 





April. 



May. 1 



June. 



1862 



66-9 



53"3 



13-6 



77'5 



6r6 



15-9 



73-2 



60-8 



12-4 



1863 



68-6 



53*5 



15-1 



72-8 



57'3 



15-5 



80-5 



63-9 



16-6 



1864 



69'i 



54*9 



14-2 



8o-8 



62-4 



18-4 



788 



62-6 



I 6-2 



1865 



73-8 



60-3 



13-5 



71-9 



60-5 



1 1-4 



79-8 



67*4 



12-4 



1866 



65-4 



53*7 



117 



69-8 



57-2 



12-6 



79-0 



66-8 



12-2 



Means 



6876 



55-14 



13-62 



74-56 



59-80 14-76 



78-26 



64-30 



13*96 



July. 



August. 



September. 



1862 



78-0 



63-4 



i4'6 



79-1 



64-5 



14-6 



75-0 



60-7 



14*3 



1863 



82-4 



667 



157 



82-2 



65-4 



16-8 



69-8 



569 



12-9 



1864 



84-1 



67-8 



16-3 



79-5 



64-4 



15-1 



76-3 



61-8 



14-5 



1865 



819 



68-8 



131 



78-1 



64-7 



13-4 



85-3 



70-2 



15-1 



1866 



78-0 



66-0 



I2-0 



78-4 



63-8 



14-6 



69-8 



59-5 



10-3 



Means 



8o-88 



66-54 



14-34 



79-46 



64-56 



14-90 



75-24 



61-82 



13-42 





October. 



November. 



December. 



1862 



65-3 



54-7 



Hio-6 



51-8 



42-4 



9*4 



51-8 



47'5 



4-3 



1863 



62*4 



53*5 



8-9 



55-4 



49-1 



6-3 



51-5 



47-7 



3-8 



1864 



62*2 



54-2 



8-0 



53-1 



47-4 



5*7 



45-0 



42-6 



2-4 



1865 



65-9 



56-3 



9-6 



55-5 



49' 3 



6-2 



50-4 



47-2 



3-2 



1866 



6o*9 



57-3 



3-6 



51-5 



1 



49-7 



1-8 



47-5 



47-1 



0-4 



Means 



63-34 



55"2o 



814 



1 53-46 



47-58 



588 



49-24 



46-42 2-82 



