add notice to ch. 3.19
add some intro text to ch. 3.19
extend 1st par, ch 3.19
extend intro text, ch. 3.19
update ch. 3.19
edit 1st par, ch 3.19
edit pars 3,4, ch 3.19
remove chapter notes, ch. 3.19
add quotation to ch. 3.19
update status icon on ToC for ch. 3.19