beginning in 1807 when Lambert was a member of Congress 
ending in 1815 when Lambert was in his last year as a U. S. Senator

It has been nine months since Lambert’s last letter to his granddaughter. The last one was shortly before the Ninth Congress adjourned on March 4, 1807. A very unsatisfactory treaty with Great Britain had arrived the day before, but President Jefferson declined to order the Congress to remain in Washington to consider it, for he was too dissatisfied with it to present it to them. So Congress adjourned, and Lambert spent his time back at home tending to his farm and his library, as well as his extensive family, which was increased on July 28, 1807 when his grandson, James Larison, was born.