Not all of the following information has been verified. For example, Thomas Newhall(b1630) has a birth record naming his mother as "Elizabeth" but here it says his father's wife was "Mary." It also doesn't explain how the author knows that Elizabeth Potter's father was Nicholas Potter; like many other records like this, that is probably a guess.

-------------------------------------

From the book:

DESCENDANTS of THOMAS WELLMAN of LYNN, MASSACHUSETTS 
By 
REV. JOSHUA WYMAN WELLMAN, D.D. 

OSTON. MASS. 
Publithed by 
ASTBVR HOLBROOK WbLUCAM 
jo CongrcM Street 
I918 

found here:

http://www.archive.org/stream/descendantsthom00unkngoog/descendantsthom00unkngoog_djvu.txt

page 142:

19. DR. JEDEDIAH* WELLMAN {Stephen*, Isaac\ 
ThomcLS^i) was bom probably at Lynn about 1710; died at 
Danvers, 25 Dec. 1766. He married at Danvers, 8 Jan. 1761, 
Jemima Newhall of Lynn, probably the daughter of Daniel 
and Mary (Breed) Newhall of Lynn. Daniel Newhall made 
his will 3 Nov. 1752, in which he named ten children including 
a daughter Jemima Newhall, then unmarried. His widow 
Mary died suddenly, 1 Jan. 1775, in her 84th year and the 
Essex Gazette states that she 'Left eleven children, sixty-six 
grandchildren and thirty-two great grandchildren." Jem- 
ima Newhall appears to be the only person of that name 
whose age was near that of Dr. Wellman. In 1790 she was 
living in Danvers as the head of a family consisting of two 
females. (Massachusetts Census, 1790, p. 68.) Her father 
Daniel was a son of Joseph* Newhall and his wife Susanna 
Farrar. Her grandfather was Thomas* Newhall whose wife 
was Elizabeth Potter, daughter of Nicholas Potter, and her 
great grandfather was Thomas Newhall whose wife was Mary 
and who was allotted land in Lynn in 1638. (Waters' 
Newhall Genealogy, 1882.) She died not far from 1792. 

Jemima Wellman was appointed administratrix of the 
estate of Jedediah Wellman, late of Danvers, 2 Feb. 1767. 
Inventory of the estate of Doctor Jedediah Wellman presented 
7 April 1767. Widow reported, 6 Oct. 1767, and commission- 
ers were appointed. They reported, 2 Aug. 1768, and the 
estate was divided among the creditors in Sept. 1768. (Essex 
Probate Records.)