[pg 83]
O
Orthotoluidine columns, . . . . . [pg 42]_
” drops, . . . . . . [pg 27]_
” equi-density temperature of, . . . [pg 16]_
” globules, movements of, . . . . [pg 66]_
” jets, . . . . . . . [pg 39]_
” spheres, . . . . . [pg 11]_, [pg 14]_
P
Petroleum, boundary surface with water, . . . [pg 6]_