The southern half of Missouri and the Black Hills of South Dakota offer exceptionally delightful regions for the study of caves, or speleology, as well as of geology and geography. Each of these regions has its peculiar geological history and its own scenery, and possesses a number of truly wonderful caves. Some of the more important of these caves and the scenery amid which they lie are described by Mrs. _Luella Agnes_ Owen in the book _Cave Regions of the Black Hills_ (Cincinnati: the Editor Publishing Company), and we have been much interested in reading the accounts. The descriptions are introduced by summaries of the methods of the formation of caves and of the results of the geological and topographical explorations of the regions in which they are situated, as presented in official reports and scientific memoirs. The descriptions are for the most part relations of the author's personal explorations of the caves. The most important of these caves are Marble Cave, "the finest yet explored in Missouri," and Wind Cave, in South Dakota, said to be the largest known after the Mammoth Cave. Others are Fairy, Powell, Stone County, Oregon County Caves and the Grand Gulf in Missouri, and the Onyx and Crystal Caves in South Dakota. Many illustrations are given. The author has fine descriptive powers, but her literary style needs discipline. She is the first American, and the only woman, so far, elected to membership in the Société de Speleologie of Paris. A valuable paper on _Sympathetic Strikes and Sympathetic Lockouts_ is published by Mr. _Fred S. Hall_ as the first number of the eleventh volume of the Columbia University Studies in History, Economics, and Public Law. In it, the author having fixed the definition of sympathetic strikes and lockouts as distinguished from those not sympathetic, and having found the difference between a strike and a lockout, discusses the origin and development of the two sympathetic movements, analyzes them, and forecasts the future as it is indicated by the past. Illustrations are freely drawn from the important strikes and lockouts that have occurred in the United States and abroad for a number of years past. _The Year Book of Colorists and Dyers_, in the opinion of the author, Mr. _Harwood Huntington_, supplies a want, for, so far as he is aware, there are no other portable works in the English language to which the color-chemist can refer and find the information which he requires the oftenest. The object of the present publication is to meet the demand for a review of the advances made annually in the special field worked in by dyers and colorists--in the bleaching, dyeing, printing, and finishing of textiles--and it endeavors to do this with accuracy and brevity. (Published by the author, New York.)