'Young’s study is an excellent example of the current state of scholarship in the history of science...I can think of only a few other studies that would provide an equally informative and fascinating introduction into the labyrinthine world of seventeenth-century natural philosophy.' Sixteenth Century Journal, Vol. XXX, No. 4 'The author has done an excellent job interpreting the extensive writings of several men involved with the 17th-century ’intelligencer’ Samuel Hartlib, particularly the obscure figure of Johann Moriaen, whose voluminous correspondence was preserved but never studied.' Psychological Reports, Vol. 86 'This book represents painstaking scholarship and careful analysis...It is Young's singular achievement that here for the first time, we have an opportunity to learn about the life and thought of Johann Moriaen...it is an exemplary piece of historical scholarship...' Ambix, no. 47 (3) 2000 'The author is a preeminent correlator on 17th century happenings which he records with penetrating vision, gravity, and profundity of thought with incisive analysis.... Rare indeed are books of this high caliber...' Bernard K Ficarra, President, The Catholic Academy of Sciences (USA) Washington DC '... a learned, valuable study of the world of early modern philosophy, education and, alchemy...' Seventeenth Century News