BappickER— On the Changes of the Radiation of Heat from the Moon. O27 
7. Cotumys I. to VI. do not call for any further remark after what has been 
said in explanation of Table I. 
Cotumys VII. and VIII. contain the factors necessary to reduce G, in Column 
VII. to the distances from earth and sun which the moon occupied during the 
middle of the eclipse. 
Cotumn IX. gives the value of G, reduced to zenith and to equal distances. 
Cotumn XI.—The adopted mean values of G are deduced from those in 
Column IX. by assigning to each @ a weight inversely proportional to the factor 
which reduces the readings to zenith (cf. /.¢., p. 599). Besides this, the former 
of the two observations of October 3 had double weight apportioned to it. 
CoLtumn XII.—z—e is, as before, the angular amount of the moon’s apparent 
illuminated phase. 
Cotumn XIII.—The weights of the adopted mean values of ¢ are apportioned 
after the following scale. ‘They are firstly proportional to the number of sets 
which constitute the mean, bringing this number for Oct. 3 into account with 14. 
The weights are secondly proportional to a certain number—ranging from 1 to 4— 
denoting the state of sky and weather, as it, at the time of observing, was con- 
sidered favourable or not for the determination of lunar heat. Thus the state of 
the atmosphere was—1, on Oct. 3 and Nov. 30; 2, on Oct. 5; 3, on Noy. 28 and 
March 29; 4, on Noy. 2 and March 24. This scale is necessarily somewhat 
arbitrary ; yet some such plan must be adopted, as the readings may among 
themselves be quite consistent and very regular, and yet to a very considerable 
degree be affected by atmospheric influences. This is for instance nearly always 
the case in slight fog, when the galvanometer-needle may be very much steadier 
than during an ordinarily clear night, and yet the values recorded, ceteris paribus, 
very much smaller. 
8. In order to deduce the most probable value of the galvanometer-reading at 
full moon, I have arranged the final values of G from Table II. according to e¢ in 
the following small Table under @,. In Column IV. are to be found the corre- 
sponding values (I) taken from the Phase Table, /. ¢., p. 605. Column-V. contains 
the logarithms of the proportions of the corresponding figures in Colums IT. and 
ie 
hE a 
