332 Profs. Percy Fraukland and Marshall Ward. 



(On exposing the dummy cells to the full glare of the sun the 

 temperatures ran up to 25 (blue) and 32 (orange), and on shading 

 they fell more slowly to 22 (blue) and 23 (orange).) 



1 P.M. 

 2 



19-0 C 

 22-0 



20-0 C 

 23-0 



(On full exposure the blue at once ran up to 25 C., and returned 

 on shading to 23'5 ; the orange ran up to 33 C., and returned to 

 24-5.) 



5 P.M 17-0 16-0 



10 12-5 13-5 



9 A.M. next morning. 13'0 13--5 



The following series were made with the screens below the cells, 

 the thin glass roofs would therefore be exposed to radiation, &c., thus 

 accounting for the more rapid changes in part at any rate. This 

 will probably suffice for calling attention to this point, which must 

 also be carefully borne in mind. I shall have opportunities of refer- 

 ring to these and other matters of the kind subsequently ; but for the 

 present this and the foregoing illustrations of the dangers may 

 suffice. 



