20. WPME p. 119
anthropologist
development of the human race
astronomer
celestial phenomena
geologist
the earth
biologist
all forms of living matte
botanist
plant life
zoologist
animal life
entomologist
insect forms
philologist
language
semanticist
meanings and psychological effects of
words
sociologist
community and family life
insects
entomologist
language
philologist
language
philologist
social conditions
sociologist
history of development of mankind
anthropologist
. meanings of words
semanticist
plants
botanist
the earth
geologist
the heavenly bodies
astronomer
all living things
biologist
animals
zoologist