60 



Miscellaneous. 



[Jan. 



Minster. Museum. Ground. 



Total Rain-fall in the year, 15-910 20-461 24-401 



or deducting a snow storm in Feb. 15-715 20-182 23*785 



Mr. Phillips arranges the numerical results of the experiments, in relation to 

 mean temperature, and the season of the year, so as to deduce the ratios of quan- 

 tity at the several stations, in the following table : 









Of Rain, 









Periods. 



Mean 



Inches on 



On mu- 



| On 





Ratios. 







Temp. 



Minster. 



seum. 



ground. 









Whole year, .... 



48-20 



15/15 



20-182 



23.785 



66-1 



85-3 



100 



7 coldest months 

















Oct.— April, .. 



40-8 



7-089 



9-725 



12-079 



58-6 



80-5 



100 



7 warmest months 

















April — October, 



55-5 



11-146 



13-669 



15.666 



71-2 



87-1 



100 



5 coldest months 

















Nov.— March, 



39-3 



4-569 



6-414 



8.119 



56-2 



79- 



100 



5 warmest months, 



58-5 



8-626 



10-457 



11.706 



73-7 



89-2 



100 



Winter quarter, . . 



36-3 



1-626 



2-326 



3.297 



49-3 



70-5 



100 



Spring quarter, . . j 

 Summer quarter, 



47-6 



3-144 



4-202 



5.256 



59-8 



80- 



100 



60-8 



6-264 



7-414 



8.121 



771 



92-5 



100 



Autumn quarter,., j 



48-3 



4-681 | 



6-240 



7.111 



65-8 



87-7 



100 



The first remark which occurs on the inspection of this table is that the ratio 

 of diminution of rain for altitude of position is nearly constant. Mr. Phillips 

 shews that it is represented by a simple formula, depending on the square root of 

 the height with one variable co-efficient ; or m s/ h = the diminution of rain at the 

 given height. 



Thus for the whole year (m being made = 2-29) 



for the Minster, to ^/ A — ^/ 212-8 X 2-29 = 66-5, by observation 66-1, to 10Q. 

 for the Museum, m K / h = ,J 43'G X 2-29 = 84-9, by observation 85*3, to 100. 

 In like manner for the seven coldest months, (m = 2*88,) the ratios are found 

 by calculation, 58 81 100 



by observation, 58*6 80*5 100 



and for the seven warmest months, (m = 1'97,) the same quantities are found 

 by calculation, 71*3 87*0 100 



by observation, 71*2 87 '1 100 



and so on, for the five-monthly periods of averages. For the shorter periods, the 

 accordance is of course less striking, but it obtains even in single months, and the 

 same formula is found to apply to Dr. Heberden's experiments on Westminster 

 Abbey, with a due variation in the co-efficient m. Whence it is concluded that 

 the relation to height is constant. 



But it is evident that the values of the variable co-efficient were very differ- 

 ent ; that its maxima and minima, were, perhaps, not quite in the same periods of 

 the year at Westminster as at York, and that the range of variation in its value 

 is much less. From M. Arago's determination of the relative quantities of rain 

 falling on the observatory at Paris, and in the court below, the relative mean 

 value of ra, at Paris = 1-24 ; while at Westminster, it is 4*23 ; and at York, 2 - 29. 

 These discrepancies are discouraging, and will probably deprive the most exact 

 local determinations of a general application. However, on account of the re- 



