BUNSEN-ROSCOE LAW 



87 



in a row in rectangular glass dishes, the stems being in- 

 serted in holes made in a layer of paraffin mixed with lamp 

 black as in the previous experiments. The rear side of 

 the dish was also coated with the paraffin lamp black 

 mixture in order to prevent reflection of light from the 

 slightly uneven back surface of the dish. 



Table VI gives a summary of the results. The first 

 three columns give the times of exposure for the three 



TABLE VI 



1 Bracketed values being extreme variates are excluded from calculations of the means 

 and probable errors. 



