1727 March 15 (Wednesday). We had very joyfull news from my Brother John. In the Evening I was at Mr. Greenwoods Lecture which was upon Projectile Motion. I can’t but Conclude these Exercises by Experiments are the most beneficial as they Reduce all to Sensible Demonstration. When I return’d I went in with Mr. Greenwood to Dr. Clarks. At home I saw Captain Willard of Salem.
Parkman’s brother-in-law John Tyley.
Isaac Greenwood, Parkman’s classmate and later first Hollis Professor of Mathematics at Harvard College.
John Clark (Harvard 1687), a physician of Boston. Professor Greenwood married Clark’s daughter Sarah. Sibley, III, 375-379.