>>17541587
Man and his symbols was the last book Jung authoured, and supposedly was designed to introduce his content to those that weren't familiar with his work, though personally I find there isn't a great difference between most of his works and that one.
I would also recommend modern man in search of a soul and maybe the red/black books if you want to read his personal experience of mental illness.
>>17541593
Well, if my judgement as a honours graduate in science is of any use, I find Jung to actually be very left brained and critical in most of his writings, and is very much a scientist in every sense of the word. He never makes assertions or conclusions without due evidence and enquiry. Despite that, the psychological contents he deals with is by nature extremely difficult to systematize and study in any reproducible manner. His theory of archetypes is however very well supported and can be consistently observed in the psyche of many different peoples independent of culture or personality. So I would say yes, he deals with it in a strictly scientific way despite the nature of his work.