of the Fishery Board for Scotland. 



281 



Stations. 



Observations were made at ten stations. The positions of these are 

 given at the head of Table I., and are further described as follows: — ■ 



Station I., new station. 



II., same position as 'Jackal' II.* 

 III., „ „ 'Jackal' XIII.* 



„ . IV., „ „ 'Knight Errant,' No. 33. f 



,, IVa., 2 to 3 miles south (true) of Station IV. 

 „ V., same position as 'Jackal' XIV.* 



VI., „ „ 'Jackal' XVII.* 



VII., ' North of Wyville Thomson Ridge.' 

 ,, VIII., same position as ' Knight Errant,' No. 28t. 

 „ IX., ' South of Wyville Thomson Ridge.' 



In addition to the information included in Table I., there are the 

 following notes : — 



Station I., at 10 am. and 11 a.m. Current, E. by N., f N. J knot. 



Station II., at 6 p.m. and 7 p.m. No current. 



Station III., 10 a.m., 2.30 p.m, 4 p.m., and 5 p.m. No current. 



Station IV., Aug. 1, 10.30 a.m. No current. Aug. 2, 11.30 a.m., 

 current, S.E. 2J knots, 8 p.m., S.E. 1 knot. Aug. 3, 11 a.m. and 2 

 p.m., no current. Station IVa. is due to the drifting of the vessel 

 southward, bringing it close up to the Wyville Thomson Ridge. 



Station V., at 10.30 a.m. and 3.30 p.m., current, E.N.E. \ knot. 



Station VI., at 10.30 a.m., current, S.E. by S. J knot. 



Station VII., at 10 a.m., current, E. by S., \ S. 1 knot. 



Methods of Observation. 



The methods of observation, in so far as the work at sea was concerned, 

 were to all intents and purposes the same as those employed on the 

 'Jackal' in 1893-94, and it is therefore unnecessary to again describe 

 them in detail. Temperature observations were made with Negretti and 

 Zambra's reversing thermometers, and a copy of the records of the actual 

 readings was supplied to me with the corrected readings appended. 

 The corrections were obtained from Kew certificates, and the work has 

 been carefully revised. Table I. gives the corrected temperatures (T x ) 

 at the depths (d.) in degrees Fahrenheit, and where duplicate observa- 

 tions were made these are added in a second column (T 2 ). As before, 

 the temperatures of Table I. were reduced to the Centigrade scale and 

 plotted. Table II. gives the temperatures at uniform depths obtained 

 from the curves ; the depths are here given in metres as well as fathoms. 

 It may be remarked that the observations, as a rule, give fairly good 

 curves. Station III. suggests a possible alternative curve between 40 

 and 120 fathoms, giving temperatures about 0 o, 5 C. higher than the one 

 adopted. Station IVa. should perhaps hardly be treated as a curve at 

 all, as the vessel was apparently drifting southward, and the temperature 

 exhibits very rapid changes close to the Wyville Thomson Ridge, which 

 would form an extremely interesting study in the unlikely event of being 

 on the spot on a day sufficiently calm and clear to make observations of the 

 required accuracy possible. The observations indicate a distinct ' under- 

 curl ' of the warm water as it passes over the edge of the ridge. 



* Twelfth Report of the Fishery Board for Scotland, Pt. III., p. 364 et seq. 

 t Proc. E.S.&, vol. xi., p. 650. 



