32 



PAPERS FROM THE DEPARTMENT OF MARINE BIOLOGY. 



Table 4.— Temperatures of the air over the reef^ and of the water on Line No. I across the 

 Southeastern reef of Maer Island, Great Barrier Reef, Sept. 30 to Oct. 23, 1913— Con. 



Date. 



1913 

 Oct. 17.. 



p. m. 

 2 h 47 m 



2 55 



3 02 

 3 10 

 3 17 

 3 24 



5 05 

 5 14 

 5 21 

 5 25 

 5 3' 

 Oct. 19. . 



a. m. 

 6 h 12° 

 6 22 

 6 30 

 6 40 

 6 50 

 6 58 



Condition of tide, wind, etc 



Calm water hardly rippled by a 

 slight northwest drift of air. 

 Water receding, low at about 

 4 h 30™ p. m. 



Water receding 



.... Do 



....Do 



....Do 



....Do 



....Do 



Distance 

 from the 

 shore, meas- 

 ured from 

 mean high- 

 tide line. 



Oct. 22... 

 12 noon 



Oct. 23. . . 



p. m. 



3 h oC" 



Tide coming in 



....Do 



....Do 



....Do 



....Do 



Intermediate tide neither neap 



nor spring. Sun just risen. 



Strong breeze from southeast 



blowing at about 20 miles an 



hour all night. 



Tide at about its lowest 



Tide beginning to rise 



Tide coming in 



Do 



Do 



Do 



400 



600 



1 ,200 



1 ,600 



1 ,860 in 



breakers. 



1 ,600 



1 ,200 



600 



400 



100 



Tide half flood. 



Tidecomingin, 10-milesoutheast 

 breeze. 



Neap tide of moon's last quar- 

 ter. Tide had been coming 

 in for the past 4 hours. South- 

 east breeze of about 10 miles 

 per hour. 



Do 



1 00 



400 



600 



1 ,200 



1 ,600 



1 ,86oir 



breakers. 



IOO 



Very near 

 shore. 



Depth of 

 water. 



4 

 6 



9 

 12 

 12 

 24 



3 

 7 

 9 

 11 



14 



12 



24 



Temperature. 



Air. 



28. 

 27 

 27 

 27 

 27 

 27 



26.8 



27-4 

 26.6 

 26.4 

 26. 1 



Water. 



24 

 ^4 

 24 

 25 

 25 

 25 



27 



28.7 



28 



28 

 28 

 28 

 28 

 29 



Difference. Water 

 warmer than air+; 

 cooler than air — . 



29.95 



14 - 

 09 - 



0.8 - 



0.6 - 

 0.85- 



0.3 - 



34 8 



6.1 + 



Table 5.— Summary of temperature of air and of water observed at various times of the day and of 

 stages in tide over southeast reef of Maer Island, Great Barrier Reef, Sept. 30 to Oct. 23, 191 3. 



