The phenomenon of “glories,” or rainbow-coloured rings round the shadow of one’s head cast on to clouds below when the summit was clear, was well observed in the mornings. Three rings were specially distinct and vividly coloured on April 26, and I was able to measure the diameters with an improvised subtense apparatus; measuring to the middle of the yellow in each case, I found the diameters of the rings to be 4½°, 8¾°, and 13°, so that the diameters increase in arithmetical progression. The shadow cast by one’s head and body was most distinct when the cloud-bank was most opaque; the rings, on the other hand, were most brilliant when there was only a thin film of cloud. The temperatures experienced on the summit were remarkable for their range. On April 25, 26, and 27, 1908, the air was still and full of wet mist, and the days were oppressively hot, while the nights were also warm and damp. On April 28, a cold north-west wind set in, which soon cleared the air; but with the clearness came such a chilling of the air that it was impossible to stand up to the instruments for observations for more than a few minutes at a time; one was glad to take shelter behind rocks from the biting blast, and though we were well within the tropics and the spring was far advanced, we sat shivering with blankets round us even in the sunniest and most sheltered spots we could find. The cold lasted till May 4, when we descended the mountain to be half roasted in the plains below. As already remarked, Gebel Elba is well supplied with water sources. The two chief are Bir Akwamtra and Bir Kansisrob, both situated on the north side of the mountain. Between them is a small spring called Megwel Akau. On the south side of the mountain are two other wells called Bir Salalat O Sir, and Bir Sararat Serimtai. In times of rainfall there must be scores of rock pools along every drainage line. =Karam Elba= is a granite hill rising to 586 metres above sea, close to the north-east foot of Gebel Elba, from which it is separated by a narrow wadi. Close north of Karam Elba are some low granite hills called =Takrat Riba=, while on the south side is another small granite hill called =Mikeriba=. To the east of Karam Elba are some granite hills which, though of no great height, are conspicuous owing to their position on the coast-plain, and being used as landmarks by the local Arabs they bear special names. These are: =Alafot=, =Taar Ara=, =Kreishim=, =Abai Sis=, and =O Wota=, the last-named being the largest of them all. Some low banks north of Alafot are called =Alafot Onqwab=.