6th September 1768

Plymouth to Madeira
Tuesday, 6th. Moderate breezes and Clear weather these 24 Hours. A.M. found the Variation by the Mean of 5 Azimuth to be 21 degrees 40 minutes West, 3 Degrees more than what it was found Yesterday, which I cannot account for,* (* Cook, as all other navigators of his time, was unaware of the deviation of the compass caused by the iron of the ship.) as both Observations appeared to me to be equally well made. At 10.28 had an Observation of the sun and moon, which gave the Longitude 9 degrees 40 minutes West from Greenwich. By this Observation Cape Finister must lay in 8 degrees 52 minutes, and by that made yesterday in 8 degrees 40 minutes. The Mean of the two is 8 degrees 46 minutes West of Greenwich the Longitude of the Cape,* (* The correct longitude is 9 degrees 15 minutes West.) its latitude being 42 degrees 53 minutes North. Wind North-West; course South 42 degrees West; distance 70 miles; latitude 42 degrees 1 minute North, longitude 9 degrees 50 minutes West; at noon, Cape Finister North 42 degrees East, 70 miles.

Joseph Banks’ Journal
Fine and calm this morn, immense numbers of Dagysa Lobata floated by, and were taken by our new contrivance, some of them in clusters as many as 14 together, united by a Lobe on the underside. Towards the Middle of the day the sea was almost coverd with dagysa's of different kinds among which two intirely new ones were taken, rostrata and strumosa, but neither of these were observd hanging in clusters as most of the other Species had been, indeed whether from the badness of the new machine or their scarcity I cannot say; only one of rostrata and two of strumosa were taken. It is now time to give some account of the genus of Dagysa, of which there are already six species taken, all agreeing in many particulars vastly well but cheifly in this very singular one, that they have a hole at each end, which holes Communicate by a tube, often as large as the body of the animal, by the help of which they swim with some degree of activity when seperated from each other, for several sorts are seen most generaly Joind together, gemma more particularly which adhere in clusters of some hundreds irregularly shap'd; in the midst of these were generaly found a few specimens of cornuta, from which circamstance we may Judge that they are very nearly allied.

It seems singular that no naturalist before this time should have taken notice of thise animals as they abound so much where the ship now is, not twenty Leagues from the coast of Spain; from hence however great hopes may be formd, that the inhabitants of the deep have been but little examind, and as Dr Solander and my self shall have probably greater opportunity in the course of this voyage than any one has had before us, it is a very incouraging circumstance to hope that so large a feild of natural history has remaind almost untrod, even till this time, and that we may be able from this circumstance alone (almost unthought of when we embarkd in the undertaking) to add considerable Light to the science which we so eagerly Pursue.

This Evening a large quantity of the Carcinium opalinum which may be calld opal insect came under the ships stern, making the very sea appear with uncommon bea[u]ty, their colours appearing with vast brightness even at the depth of two or three fathoms, tho they are not more than three lines long and one broad.

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