English edition of "Synopsis universae medicinae practicae: sive Doctissimorum virorum de morbis, eorumque causis ac remediis judicia: praxi & observationibus....", published in 1719, a work which became extremely popular, being printed in many editions at home and abroad, both in Latin and translated into modern languages. The work claims to be entirely practical, and not to deal with the new views and hypotheses which abounded in the medicine of the time. It gives, under the head of each disease, the opinions of various authors, ancient and modern, to which the writer added, especially in later editions, certain observations of his own. In 1730 Allen was elected a fellow of the Royal Society