1877.] 



Atmospheric Pressure at tlie Sandheai 



341 



Noon 



+ -032 



— -019 



— Oil 



1 p. M. 



— -002 



•000 



— -001 



2 „ 



— •031 



— •OlH 



— •OIO 



3 „ 



— -018 



— 031 



— -014 



4 „ 



— -054 



— ^035 



— 016 



5 „ 



— •051 



— 031 



— -OlG 



6 „ 



— -040 



— '021 



— •ou 



7 „ 



— •024 



— ^007 



— •008 



8 „ 



— •007 



+ -007 



+ -002 



9 „ 



+ -OOG 



+ -016 



+ 014 



10 „ 



+ -012 



+ •ois 



+ -023 



11 » 



+ •oio 



+ ^013 



+ ^024 



ae above observations are plot 



:ed in the followins 



<• diao^ram. 



Thick line— Sandheads. (0. H.) 



Thin „ do. (H. F. B.) 



Dotted „ Calcutta. 

 I have worked the values of the 4-hourly periods for the belts of lati- 

 tude, from 20° to 21° N. and 21° to 22° N., as well as the combined result, 

 consequently give them below. 



4 A. M. 



8 A. M. 



Noon. 



4 p. M. 



8 p. M. 



30005 



30^063 



30-047 



29-991 



30033 



— 022 



+ ^036 



+ -020 



— ^036 



+ •OOG 



29^977 



30031 



30021 



29-973 



30013 



— •028 



+ -020 



+ •OlG 



— •032 



+ -008 



Midt. 



30025 



— •002[ 



Mean. 

 30-027 



Diff. from 

 Daily Mean. 



30013 30005 



+ -008 



ri)iff. from 



( 20° to 21° 



f21° to 22° 

 I N reject- 

 \ ing excep- 

 paiiyMean. j tionalrcad- 

 L.ing— -158. 



The main reasoning of Mr. Blanford's paper is only affected in so far 

 as the amount of difference, on which the reasoning is based, is considerably 

 lessened. 



I venture the above remarks as I gather from Mr. Blanford's paper 

 that he intends eventually dealing with the other months in a similar 

 manner. 



The results given by me have not been thoroughly checked for want 

 of time. 



London, dth October, 1877. Ctiatilii16 Harding. 



