of Dr. Holyoke. 215 
Dr. Holyoke completed his hundredth year on the 13th of 
August 1828, on which occasion the physicians of Boston and 
Salem united in exhibiting to him some marks of their respectful 
consideration. In October following there is an interruption of 
two or three days in his journal, occasioned by his absence on a 
visit to Boston and Cambridge. At this time he attended a 
meeting of the Counsellors of the Massachusetts Medical Society 
(of which he was one of the active founders, and the first presi- 
dent,) and visited many of the literary and scientific institutions in 
Boston, and the scenes of his childhood and youth, in Cambridge. 
In the morning of the first day of March, 1829, the last entry 
is made in his meteorological journal. On that day he was first 
confined to his chamber by his last illness; and on the 31st day 
of the same month, he closed his long life of usefulness and 
benevolence. 
In the preliminary remarks, some calculations were given, 
designed to ascertain the true mean temperature of Salem, as 
exhibited by these journals, after the proper allowances should be 
made for the hours of observation, and for such other circum- 
stances as may be supposed to affect the result. In these esti- 
mates it was proposed to allow one or two degrees for the effect 
of reflected heat acting upon the thermometer during the day. 
But on comparing the later journals with a similar journal kept by 
myself during a portion of the same period, I find reason to be- 
lieve that the apparent increase of temperature from this cause is 
at least fully counterbalanced by the opposite effects of radiation 
during the night ; and consequently that no reduction of the mean 
temperature should be assumed on this account. 
