THE NAUTICAL ALMANAC FOR 1929.—A number of changes and additions in this issue of the “Nautical Almanac” call for comment. At the meeting of the International Astronomical Union at Cambridge in 1925, a resolution was adopted to the effect that the ephemerides should give 5-figure values of the of the logathms quantities ρ sin θ and ρ cos θ, including the effect of altitude, for each observatory. This has already been done, and natural values as well as logarithms are given. The number of observatories listed has been more than doubled, while the list has been divided into two—active observatories and former observatories. A third or index list gives every conceivable cross-reference. The lists appear to be very complete, and it is stated that in each case the authority for the latitude and longitude is a reply sent by the observatory to a circular letter.