the ice reports from the extreme northern part of the ice-patrol area 

 were few in number. 



During tliis cruise the total number of water-temperature reports 

 received by radio increased markedly, showing that cooperation from 

 shipping had attained its usual mid-season form. 



THE FOURTH CRUISE, "MODOC," APRIL 10-24 



Figure 6 depicts the ice and surface water temperature conditions 

 which the Modoc found to be prevailing about the Grand Banks 

 between April 10 and 24. No ice menaced the " B " tracks to and from 

 the United States. Early in the cruise, the Canadian tracks were 

 moved northward from "D'' to "E." This action sent two streams 

 of reporting vessels across the area between Flemish Cap and the 

 Grand Banks and enabled the patrol to have more definite information 

 relative to ice conditions in the northern part of the patrol area than 

 earlier in the year. It became apparent that the number of icebergs 

 between the forty-sixth and forty-ninth parallels was about the aver- 

 age for April. South of the forty-sixth parallel, however, the icebergs 

 were distinctly deficient in number. This deficiency had been noted 

 during the two preceding cruises. 



No field ice whatever was reported from the Grand Banks region 

 during this cruise. The very early disappearance of the flat ice was 

 thought to presage the early ending of the southerly drift of icebergs 

 to the Tail. An extremely early ending of the berg season did, in 

 fact, take place, as will be found by comparing the monthly ice maps 

 contained in this pamphlet with the similar ice maps published in the 

 issues of previous years. 



THE FIFTH CRUISE, "MOJAVE," APRIL 24-MAY 9 



The fifth cruise is graphically depicted by Figure 7. One berg was 

 caught in a well-developed push of cold water south of the Tail. It 

 was carried southeastward across the "B" tracks to and from the 

 United States. The Mojave watched the southernmost bergs as 

 closely as possible, depending as usual upon reports from cooperating 

 vessels for information relative to ice north of the forty-fourth 

 parallel. 



THE SIXTH CRUISE^ "MODOC," MAY 9-24 



Figure 8 shows the conditions which confronted the Modoc during 

 the sixth cruise. The southeasternmost berg of the preceding cruise 

 was reported several times before it finally melted in the vicinity of 

 41° 30' N., 46° 30' W. A strong push of cold water developed east 

 of the Tail between the forty-third and forty-fourth parallels. This 

 push took one berg across the principal westbound "B" tracks to the 

 United States. 



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