49 REPORT — 1841. 



vide two actinometers, for observations on the intensity of Solar Radiation, to 

 be made by Prof. Agassiz, at considerable heights in the Alps, and that the 

 sum of 10/. be placed at the disposal of the Committee for that purpose ; " — 

 " That Major Sabine be requested to provide a good mountain barometer and 

 a thermometer, for the assistance of Mr. M'Cord in his meteorological ob- 

 servations — the sum of 20/. to be placed at the disposal of Major Sabine for 

 the purpose " — Col. Sabine reported, that M. Agassiz had been supplied with 

 two actinometers, at the cost of 10/.; and that a good mountain barometer 

 was forwarded to Mr. M'Cord early in the spring of this year, having been 

 previously compared with the standard barometer of the Royal Society ; and 

 that a thermometer was not sent, because Mr. Newman informed Col. Sabine 

 that an excellent standard thermometer had been ordered by Mr. M'Cord 

 himself, and had been forwarded to him. The cost of the mountain barome- 

 ter was 6/. 12s. 6d. 



Report of a Committee, consisting of Sir J. Herschel only, to super- 

 intend the reduction of Meteorological Observations. — July 1841. 



During the last year several series of observations for the years 1837 and 

 1838, as well as a few for 1839, have dropped in, and every endeavour has 

 been made to procure copies of such as were still wanting from stations 

 whence there was reason to presume that observations were forwarded but 

 had never come to hand. These endeavours, in several instances, have proved 

 successful, and in consequence the list of stations at which available series, 

 having some degree of consecutiveness and connexion, can be made out, is 

 considerably enlarged. The whole number of series in hand, and under re- 

 duction at present, amounts to upwards of three hundred, being the results 

 of observations at about seventy stations. 



In the year elapsed, Mr.Birt has been employed intabulating, reducing, pro- 

 jecting, and comparing the barometric curves, a process which has been com- 

 pleted for the whole of the American group (which is by far the most numerous 

 and consecutive) for the years 1835, 1836, 1837, and for March 1838, com- 

 prising eighty-eight series, made at the following twenty-eight stations, viz 



Quebec. Western Reserve College. St. Catherine's Island. 



Montreal. Flushing. Magnetic Island. 



Gardiner. New York. Gulf of Guayaquil. 



Burlington. Baltimore. Realejo. 



William's College. Cincinnati. Conchagua. 



Albany. Natchez. San Bias. 



Boston. Washington. Ohreala. 



Providence, R. I. St. Louis. Norfolk Sound. 



Newhaven. Nassau (Bahamas), on shore. 



Middletown. Bahamas, at sea. 



One term also has been reduced and projected (June 1836) for each of 

 the other groups, comprising seventeen series, at the same number of sta- 

 tions, viz. — 



London. Brussels. Gibraltar, Bangalore. 



Oxford. Hanover. Cadiz. Feldhausen, C.G.H. 



Halifax. Geneva. Mauritius. R. Observatory, C.G.H. 



Limerick. Turin. Dadoopoor. Bathurst. 



Markree. 

 making in all 105 series reduced and projected. 



