In speculo teipsum contemplare Dr. Black. A looking-glass for the black band of doctors [electronic resource] : VVherein may be seen the ignorance and malice of these physicians, who have clubbed under the name of Dr. Black, for suppressing by their scriblings, and other calumnies, so great a benefite to the world, to the new game of rivers. / Contained in a 2d. letter written by Philander to his friend in the countrey Philomathes. In defence of Dr. Brown.