Huxley is commenting that most people in society prefer to live in "happy ignorance" as opposed to having knowledge. The stars, or truth, are "depressing."
This is because that many find the truth upsetting and would prefer to live in the dark. Huxley is saying that for many, ignorance is bliss.
It is the act of thinking of a scholar as a function of the whole human being.
Do i agree with the ideas presented?
do i think the writing is interesting?
do i like the essay?
do i see that the writer tried to add style to the essay
do i notice that the writer tries to engage readers?