E. Loomis — Contributions to Meteorology. 7 



length was four and a half times its breadth, having its longest 

 diameter directed towards the northeast, St. Louis being near 

 the southwestern extremity of this oval, and the pressure at 

 St. Louis was only 0O4 inch above the lowest pressure reported 



In No. 10 the isobar 29'50 formed a long oval whose princi- 

 pal axis was directed towards the northeast. Cairo being near 

 the southwestern extremity of this oval, and there were indica- 

 tions of a cyclonic movement of the winds of a loca 

 about Cairo. 



In No. 23 the greatest precipitation (0*87 inch) was at 

 Omaha on the northwest side of the low center ; but at Cincin- 

 nati on the east side the rain-tall was 0-s0 inch and the rain- 

 about Omaha. Under these circumstances the low center ad- 

 vanced eastward, but at a very slow rate, and the precipitation 

 at Omaha apparently served to retard the eastward movement 



In No. 41 the lowest isobar formed a lonsi oval directed 

 towards the N.N.E. and extending beyond 'the stations of 

 observation ; so that the amount of the precipitation on the 

 northeast side of the low center is not fully known. There 

 was however a considerable fall of snow during the preceding 

 sixteen hours at several of the stations north of the low center. 

 ♦The following are the amounts at four of the stations for the 

 two periods of eight hours each, the snow being expressed in 

 its equivalent of water. Kingston (V42 + 0-34 = 0-76 inch; 

 Ottawa 0-45 + 0-30 = 0-75 inch : Montreal 0-2O + <KJ0 = 0-5o m( ,h : 

 Quebec 0'10+0-27=0'37 inch. It is probable that a considera- 

 ble fall of snow extended much further northward. 



In No. 55 the isobar 29 '20 formed an oval whose length was 

 more than double its breadth with towards the 



northeast, and on the northeast side was a rain area of much 

 greater extent than that about Knoxville. The rain-fall at 

 Kuoxville was <M»o inch, and that at Oswego on the northeast 

 side was 0-63 inch. 



In Xo. lis the lowest isobar is incomplete, but is evidently 

 much elongated towards the north, and extends into Canada 

 beyond the stations of observation. 



In order to render this comparison more complete, I will 



we refer each rain-area to the position of the low center at the 

 nnddle of the period during which the reported rain was fall- 

 more than 500 miles south of the low center, the following are 



appeared to be west of the low venter, vi/ : .Vk 14, 26, 46, 

 47 and 53. 



