180 Mr Galbraith on Workman's Correction 



and in those under the largest size, there were 24 in each jaw ; 

 those Jidl grown seemed to have lost some of their teeth.*" 



It seems to me probable, that the animal lately described as 

 a new species by the French savans, under the name of Del- 

 phinus Globiceps, is only my D. Deductor, which has a semiglo- 

 bular snout. 



I may here remark, that, in my original description, by a 

 misprint, the pectoral fins were said to be Jrom (5 to 8, instead 

 oljrom 4 to (i feet long. Another, of which the measurements 

 were published in Scoresby''s work, had a length of ]9| feet, 

 and the free part of its pectoral fins was only 3 J feet by li foot. 



In this species the spiracle has its cornua pointing forward. 

 Mr Scoresby has also published a figure and admeasurements of 

 Balana Rostrata, taken by Mr Watson from a stranded speci- 

 men. In Mr Scoresby''s work, the circumference is stated at 

 20 feet ; but in another set of admeasurements, in Mr Watson^s 

 handwriting, I find the girth given at 10 feet only. 



This species of whale may be readily discriminated from the 

 young of the allied species, by the colour of its palatal laminae, 

 which are in it whitish^ while they are dark brown in the other 

 species. 



A fine specimen of the B. rostrata was, about two months 

 ago, caught in the Firth of Forth, and exhibited in this city. 

 It agreed exactly with the Orkney specimen in its external ap- 

 pearance ; and a good account of its anatomical structure may 

 be soon expected from Z>r Knox, who has dissected the animal. 



On Workman^s Correction of Middle Latitude Sailing. By 

 William Galbraith, A. M., Teacher of Mathematics, 

 Edinburgh. Communicated by the Author. 



It has lately been the practice to introduce into several ele- 

 mentary books which treat of the principles of navigation, a ta- 

 ble by Mr Workman to adjust the arc called the Middle Lati- 

 tude, so as to produce the same course and distance as by Mer- 

 cator''s sailing, when the earth is considered to be a sphere. 

 This correction is, indeed, generally small, and by the nature 



