AMERICAN JOURNAL OF SCIENCE. 



[THIRD SERIES.] 



.RT. I. — Contribx : being results derived fro 



on examination of tin: obserratj of the United States Sign 



Service, and from other soi i, -rr-s; bv Klias Looms, Professc 

 of Natural Philosophy in Yale College. Seventeenth pape 

 With three plates. 



Read before the National Academy of Sciences, Washington, April 18, 1882.] 



RtlotH),, <>f rain amis to a reus <f loir pressure. 



the total rnin-fall at all the stations of the Unite-l - 

 Service amounted to at least eight i • i ^s in . _'• * h mrs, 'br- 

 ing a period of fifteen months. As the tri-daily observation 

 have since that time been published for twentv-two additional 

 months (viz: from Dec. 1873, to Jan. 1875, inclusive, and 

 from Jan. 1877, to Aug. 1877) I propose to t 



animation t 



;o these 



later observations. 



The 



f..!l0 



wing 



table 





the case 



s from Dec. 1873, to 



Jan. 



187/ 





which 



the total ra 



mdali at 



all the stations amo 



unted 



to ai 



t. 'ra. 



t nine 



inches in e 





rs; also all the cast 





n da 



n., l> 



77. to 



June, 1877, 





h the total rain -fall 





nted 





t lea >t 





in eight 



hours ; and for Jul; 



, and 



•W 





1-77. 





) eleven i 



nches in eight hours. 



Thi 





itige 



in the 



miount of 





adopted as the sta 







dcred 



lecessary by the gradually increased nurn 



her of 



■ the 



static 



ma of 



>bservation. 















In the following table column first show 



ra the 



reference 



nam- 



