8. April 16—23, 1874, from Gulf St. Lawrence to Nor\vay. 



9. May 23—30, 1874, from Gulf St. Lawrence to Norway. 

 10. Aug. 1—4, 1874, from Gulf of St. Lawrence to North 



Cape. 



11 Aug. 12—17, 1874, from Hudson Bay to Norway. 



If the observations each day were sufficiently numerous to 

 show the isobaric curves for every part of the Atlantic Ocean, 

 doubtless many more storms might be traced from America to 

 Europe, but it is presumed that such cases do not occur on an 

 average more than once or twice a month. The storms of Eu- 

 rope generally have their origin considerably east of the Amer- 

 ican Continent and soon become so violent as to draw within 

 their influence any small barometric depression which started 

 from America. 



Velociti/ of Ocean Storms. 



The average velocity of storms upon the Atlantic Ocean as 

 deduced from 134 cases on the French maps is 19*3 miles per 

 hour; the velocity deduced from 49 cases on the Danish maps 

 is 20-3 miles per hour ; giving an average of 19-6 miles per 

 hour from both series of maps. The average velocity for the 

 storms of the United States as deduced from 485 cases is 26 

 miles per hour. From a considerable number of cases in Eu- 

 rope, Prof. Mohn has deduced an average velocity of 26 7 miles 

 per hour. These numbers indicate that storms travel with less 

 velocity over the Atlantic Ocean than they do over the Conti- 

 nents of America and Europe ; and it seems to follow that the 

 progressive movement of a storm is not the result of a simple 

 drifting of the atmosphere ; for it seems probable that the aver- 

 age progress of the atmosphere in an easterly direction is as rapid 

 over the Atlantic Ocean as it is over North America. 



Storms of Jan. 29— Feb. 8, 1870, on the Atlantic Ocean. 



A succession of storms of unusual severity passed over the 

 Atlantic, between Jan. 29 and Feb. 8, 1870, an account of 

 which has been published by Capt. Henry Toynbee, of the 

 London Meteorological office. On the 30th of January an area 

 of low barometer prevailed near Nova Scotia ; on the 31st it 

 was east of Newfoundland ; and on the 1st of February it was 

 merged in another storm which had prevailed for several days 

 on its eastern side. On the 2d of February a second storm cen- 

 ter appeared near Newfoundland ; on the 3rd it had advanced 

 east about 700 miles ; and on the 4th it became merged in 

 another storm off the Irish coast. 



On the morning of the 5th a third storm appeared near the 

 center of the Atlantic, which must have developed with unu- 

 sual rapidity, since on the preceding day, observations had in- 

 dicated no great atmospheric disturbance in that neighborhood. 



