3 46 Messrs Coldstream and Foggo’s Meteorological 
ble part of the time constantly below the horizon ; and that not- 
withstanding these impediments, we have hourly observations, 
day and night, for nearly six months, it must be obvious, that 
the views of the two leading observers must have been cheer- 
fully seconded by every officer ; and we are pleased to observe, 
on this point, the most cordial and liberal acknowledgment on 
the part of the authors, of their obligation to Captain Hopner, 
to Mr Hooper, and to the officers in general, for their valuable 
assistance. 
Besides the above communications to the Royal Society, se- 
veral other experiments and observations were made ; viz. on 
the application of Barlow’s correcting plate ; on the refraction 
of the atmosphere ; on Daniel’s hygrometers on the radiation of 
heat and the velocity of sound, which will be published in the 
appendix to the Account of the .Voyage, at present in the press, 
by Captain Parry. 
Aut. XXI . — Meteorological Observations made at Leith. By 
Messrs Coldstream and Fqggo. 
J[ HE journal, from which the following monthly results are 
extracted, is kept about 20 feet above the level of the sea, and 
a few hundred yards distant from it. The Thermometer is re- 
gistered at 9 a. m. and 9 p. m. ; the Barometer at 9 a. m. Noon, 
4 p. m. and 9 p.m.; the Rain-Gauge and Wind-Vane at Noon. 
The Hygrometrical observations are made by means of two 
Thermometers, one of which has its bulb covered with silk, and 
moistened with water ; their indications are registered at noon. 
DECEMBER 1825. 
Results. 
1. Temperature. 
Mean of the month, 
Maximum by Register Thermometer, 
Minimum by ditto, 
Range, 
Mean of the extremes, ..... 
2. Pressure. 
Mean of the month, 
Maximum observed, 
Minimum observed, 
Range, 
Fahr. Ther. 
. 39°.295 
. 51.500 
. 26.000 
. 25.500 
. 38.750 
Inches. 
. 29.447 
. 29.850 
, 28.750 
. 1.100 
