67 



March, April, October and November. They refer to then- 

 specific gravities and temperature, and also to that of the 

 air on board ship at the time, and the direction of the wind 

 at the time prevailing. These particulars have been drawn 

 out in diagrams showing their state for nearly every mile 

 or so of the route through, and they thus bring out special 

 curves of increasing or diminishing density and temperature 

 of the canal water, from the Mediterranean to the Red Sea. 

 Also the whole set of records have been summarised both 

 horizontally by voyage for the totals and means, and per- 

 pendicularly for nearly every mile for the same, and general 

 means have been calculated for the entire set added to- 

 gether. 



For the voyage in February, the results are mean specific 

 gravity of canal water 1*0416, temperature of water mean 

 60°'9 F., temperature of air on board, maximum 67°'3, mini- 

 mum 60°% mean 63°-8. Winds, S.W. and N. (On land, 

 M.T. 55"-^, Hy. 70.) 



For March, the water shows a specific gravity mean 

 1*0408, temperature mean, 65° F,, temperature of air and 

 direction of winds not recorded, but were probably prevailing 

 from N.E. and N.W. (On land, M.T, 63°-2, Hy. 66-6.) 



For April, the canal water had a mean specific gravity of 

 1"0434 and mean temperature of 70°'l F., no record of air 

 or winds, which were probably N., N.W., W. (On land, 

 M.T. 65-8, H. 63.) 



For October, the water showed a mean specific gravity of 

 1'0345, and mean temperature of 76°, whilst that of the air 

 on board was maximum 77°, minimum 71°, mean 74°, and 

 the winds were from N.E. and N.W. (On land, M.T. 72°-4, 

 Hy. Q6-6.) 



For November, the water had a mean specific gravity of 

 1"0392, and a mean temperature of 69°; no record of air or 

 winds, which were probably N.W., N., S. (On land, M.T. 

 64°-5, Hy. 71.) 



The general totals and means comprise 15 days' sailing, 

 450 miles, 150 observations, specific gravity 1'0399, tempera- 

 ture of canal water, Q8°-2 F., temperature of air on deck, 

 68°-9 F., on land, M.T. 69°-12, Hy. 68. 



