“This is one of the volumes of ‘The International Scientific Series,’ and was originally planned by Mr. Clifford; but upon his death in 1879 the revision and completion of the work were intrusted to Mr. C. R. Rowe. He also died before accomplishing his purpose, and the book had to be finished by a third person. It is divided into five chapters, treating number, space, quantity, position, and motion, respectively. Each of these chapters is subdivided into sections, explaining in detail the principles underlying each. The whole volume is written in a masterful, scholarly manner, and the theories are illustrated by one hundred carefully prepared figures. To teachers especially is this volume valuable; and it is worthy of the most careful study.”—_New York School Journal._ JELLY-FISH, STAR-FISH, AND SEA-URCHINS. Being a Research on Primitive Nervous Systems. By G. J. ROMANES, F. R. S., author of “Mental Evolution in Animals,” etc. 12mo. Cloth, $1.75. “A profound research into the laws of primitive nervous systems conducted by one of the ablest English investigators. Mr. Romanes set up a tent on the beach and examined his beautiful pets for six summers in succession. Such patient and loving work has borne its fruits in a monograph which leaves nothing to be said about jelly-fish, star-fish, and sea-urchins. Every one who has studied the lowest forms of life on the sea-shore admires these objects. But few have any idea of the exquisite delicacy of their structure and their nice adaptation to their place in nature. Mr. Romanes brings out the subtile beauties of the rudimentary organisms, and shows the resemblances they bear to the higher types of creation. His explanations are made more clear by a large number of illustrations. While the book is well adapted for popular reading, it is of special value to working physiologists.”—_New York Journal of Commerce._ “A most admirable treatise on primitive nervous systems. The subject-matter is full of original investigations and experiments upon the animals mentioned as types of the lowest nervous developments.”—_Boston Commercial Bulletin._ New York: D. APPLETON & CO., 1, 3, & 5 Bond Street. ------------------------------------------------------------------------ Transcriber’s note: Front matter, ‘By’ changed from small caps to letter case, “By JAMES CROLL, LL.D., F.R.S. With” Page 2, comma inserted after ‘Mag.,’ “Phil. Mag., July 1878;” Page 25, full stop inserted after ‘Lectures,’ “Manchester Science Lectures.” Page 37, heading ‘Testimony...’ changed to small caps. Page 41, ‘years’ inserted, “Mean        3,378   years” Page 54, full stop inserted after ‘Mem.,’ “Mem. Geol. Survey of Lancashire” Page 59, full stop inserted after ‘vol. i.,’ “Memoirs of Geol. Survey, vol. i.” Page 113, ‘radicles’ changed to ‘radicals,’ “argument from compound radicals” Page 115, ditto inserted, “„ on examples of enormous faults”