M.-P— Vol. I.] CRAWFORD— CONSTANT OF REFRACTION. 179 



[p] = 58; log[pvv] = 6.1255 



A — 0.00084 



p. e. = i 0.00018 



[p~l = 49^ ; l °g \P vv ] = 6.0359 



A I — 000033 



p. e. = i 0.00019 



