THE Bibliography of Seismology, 13, No. 2, published by the Dominion Observatory at Ottawa, has just been received. It contains 124 items over the period April, May, June 1939, and has been compiled with the assistance of collaborators in Canada, United States, New Zealand, Italy, Germany, Norway, Japan, U.S.S.R., France, Holland and England. As in the preceding number, in addition to works on pure seismology, there is again a considerable number of works listed on applied seismology, chiefly concerned with geophysical prospecting. A list of patents concerned with this latter contains eight items, five being United States patents, one Canadian, and two U.S.S.R. It is pleasing to see a considerable number of papers listed from the Seismological Institute, Academy of Sciences, U.S.S.R., though it would add to the value of these Russian works if the authors supplied translations, or abstracts in French, German or English. Unfortunately, again South America is not represented.