Year 1907 (Parts I and II) Price, 150 mill. each part. Year 1908 (Parts I and II) Price, 150 mill. each part. =Nile Flood.= MEASUREMENT OF THE VOLUMES DISCHARGED BY THE NILE DURING 1905 AND 1906, by E. M. DOWSON; WITH A NOTE ON RATING FORMULÆ FOR CURRENT-METERS, by J. I. CRAIG. (Survey Department Paper, No. 11). 82 pp., 6 illustrations. Price, 100 milliemes. RAINS OF THE NILE BASIN:— In 1904, by CAPT. H. G. LYONS. 25 pp., 1 map, 5 illustrations. Price, 50 milliemes. In 1905, by CAPT. H. G. LYONS. 40 pp., 4 maps, 5 illustrations. Price, 50 milliemes. RAINS OF THE NILE BASIN AND THE NILE FLOOD:— In 1906, by CAPT. H. G. LYONS. (Survey Department Paper, No. 2). 70 pp., 5 maps, 11 illustrations. Price, 100 milliemes. In 1907, by CAPT. H. G. LYONS. (Survey Department Paper, No. 9). 50 pp., 1 map, 11 illustrations. Price, 100 milliemes. In 1908, by CAPT. H. G. LYONS. (Survey Department Paper, No. 14). 69 pp., 1 map, 8 illustrations. Price, 100 milliemes. In 1909, by J. I. CRAIG. (Survey Department Paper, No. 17). 55 pp., 1 map, 8 illustrations. Price, 100 milliemes. =Special Papers on Meteorology.= ATMOSPHERIC ELECTRICITY—DISCUSSION OF THE OBSERVATIONS ON—AT HELWAN OBSERVATORY, FROM MARCH 1906 TO FEBRUARY 1908, by H. E. HURST. (Survey Department Paper, No. 10). 65 pp., 2 maps, 8 illustrations. Price, 100 milliemes. CLIMATE OF ABBASSIA, NEAR CAIRO, by B. F. E. KEELING. (Survey Department Paper, No. 3). 1907. 61 pp., 1 map, 7 illustrations. Price, 100 milliemes. EVAPORATION IN EGYPT AND THE SUDAN, by B. F. E. KEELING. (Survey Department Paper, No. 15). 1909. 29 pp., 1 illustration. Price, 100 milliemes. PLATINUM-RESISTANCE THERMOMETERS—REPORT ON THE USE OF—IN DETERMINING THE TEMPERATURE OF THE AIR AT THE HELWAN OBSERVATORY, by E. B. H. WADE. 1905. 20 pp., 5 illustrations. Price, 50 milliemes. =Surveying.= ALTITUDES—THE DETERMINATION OF—BY LEVELLING, by E. M. DOWSON. (Technical Lecture). 1908. 23 pp., 6 illustrations. Price, 50 milliemes. CADASTRAL SURVEY OF EGYPT, 1892-1907, by CAPT. H. G. LYONS. 1908. 421 pp., 30 maps, 16 illustrations. Price, 400 milliemes. CADASTRAL SURVEY OF EGYPT—COMPARISON OF—WITH THOSE OF SOME EUROPEAN COUNTRIES, by CAPT. H. G. LYONS. (Technical Lecture). 1909. 24 pp., 8 maps. Price, 50 milliemes. ERRORS OF OBSERVATION, by T. L. BENNETT. (Technical Lecture). 1908. 27 pp., 3 illustrations. Price, 50 milliemes. LONGITUDE—DETERMINATION OF, by E. B. H. WADE. (Technical Lecture) 1908. 39 pp., 2 maps, 1 illustration. Price, 50 milliemes. LONGITUDES—A FIELD METHOD OF DETERMINING—BY OBSERVATIONS OF THE MOON, by E. B. H. WADE. (Survey Department Paper, No. 5). 1907. 47 pp., 9 illustrations. Price, 100 milliemes. MAP-PROJECTIONS, by J. I. CRAIG. (Technical Lecture). 1909. 25 pp., 1 map, 25 illustrations. Price, 50 milliemes.