of the Fishery hoard for Scotland. 



265 



Trip of April 1896. 



I joined the ' Garland ' at Gourock on April 2nd, and made preliminary 

 observations that day in Loch Goil and the Dunoon Basin, remaining for 

 the night at Brodick. On the 3rd observations were made off Brodick, 

 and a careful temperature cross-section at Skate Island through the 

 deepest water of the Clyde Sea Area. The 'Garland' lay for the night 

 oft" Otter Ferry. On the 4th a complete series of observations was made 

 along Loch Fyne at Otter, Gortans, Minard (i.e., at the entrance, centre, 

 and outlet of the shallow Gortans Basin), and at Furnace, Strachur, Inver- 

 aray, Dunderawe, and Cuill in the deep Upper Basin of Loch Fyne. On 

 the 6th observations were repeated at Cuill, Dunderawe, a cross-section at 

 Inveraray, Strachur, Furnace, Minard, Gortans, Otter, and near Kilfinan. 

 That evening the ' Garland ' reached Rothesay, and next morning I left 

 at Gourock. 



The observations included temperature at close intervals from surface 

 to bottom, and the collection of samples of water for analysis. The 

 instruments employed were those belonging to the Board, including 

 reversing thermometers and slip-water bottles. The samples for analysis 

 were collected in bottles supplied by Mr H. N. Dickson, by whom they 

 were subsequently examined in the University Laboratory, Oxford. The 

 methods of observation, and the stations at which the soundings were 

 made, were the same as those adopted in my earlier work on the Clyde 

 Sea Area, and fully described in the Transactions of the Royal Society of 

 Edinburgh. I have not been able to find time for the very laborious task 

 of completely discussing the data of the two trips, but the figures cor- 

 rected for instrumental errors are published herewith, except the hydro- 

 meter-readings, which have not yet been calculated. This omission is of 

 no practical importance, as Mr Dickson's Sprengel-tube determinations of 

 density are of a higher degree of accuracy. Without fully discussing the 

 data, some conclusions may be stated in a few words. 



Temperature Observations in April 1896. — A general idea of the con- 

 dition of temperature in the whole Clyde Sea Area was obtained. It 

 was evident that the water was nearly at its annual minimum of tempera- 

 ture, and consequently nearly homothermic, the small range of temperature 

 making it impossible to localise movements of the mass of the water. 

 The data are all given in Table L, which gives particulars of twenty-four 

 temperature soundings. 



On April 2nd, in the deepest part of Loch Goil, the temperature was 

 found to diminish from 45°'4 on the surface to 44°*8 at 12 fathoms, then 

 increase to 45°*8 at 21 fathoms and fall again to 45°*2 at the bottom. In 

 the Dunoon Basin, outside, the temperature fell from 45°*2 on the surface 

 to 44° 3 at 15 fathoms, and then remained practically constant to the 

 bottom. 



On April 3rd a series of observations was made in the Arran Basin, as 

 a preliminary to work in Loch Fyne. The water was very nearJy homo- 

 thermic, with an average temperature of 44° '5. Off Brodick, in the East 

 Arran Basin, the surface temperature was 45°0, falling to 44°*0 at 10 

 fathoms, and rising again to 44°"6 at the bottom (55 fathoms). This 

 slight intermediate minimum was also found in the deep water (106 

 fathoms), off Skate Island, where the surface temperature was also 45° ; 

 the minimum was probably 44° *2 at 25 fathoms, and at 40 fathoms a 

 temperature of 44° 7 was found, which remained constant to the bottom. 

 Observations midway between the deep sounding and the shore on each side 



