June 23, 1893.] 



SCIENCE. 



349 



or two, there is nothing to indicate that it might not have come 

 from an English or American printing office. Yet the whole of 

 it, plates and text, is the product of a Japanese oflSce. It is also 

 a striking example of the extended use of the English tongue 

 when a paper of this character appears in our language instead of 

 French or German. 



The paper is the result of several years of study by the author, 

 and shows great industry and research. The Archsean is divided 

 into an upper and lower division. In the former are placed the 

 Grozaisho and Takanuki series, and in the latter the Laurentian. 

 The Gozaisho series is estimated to have a thickness of 10,000 

 metres. The Takanuki series was found too distorted to estimate 

 the thickness. Many details of sections are given, and there is 

 also an extended discussion of the origin of the various rocks, 

 and of their lithological characters. The paper is worthy the 

 attention of students of the Arch»an formations. 



Joseph F. James. 



May 5. 



The Microscopical Examination of Potable Water. By Geo. W. 

 Rafter. New York, D. Van Nostrand Company. 160 p. 

 18°. 50 cts. 



TfflS little book, forming No. 103 of the Van Nostrand Science 

 Series, fully bears out the character of preceding volumes, and, 

 like them, will be well received by all. The plain language used 

 puts it at once within the limits of beginners in microscopical 

 water analysis, and, at the same time, it affords a handy resume 

 of work done for the use of the professional student. Care has 

 evidently been taken by the author to give as completely as possi- 

 ble " the state of the art" to the date of issue, and in this particu- 

 lar the book is in advance of some of its more pretentious rivals. 



It is divided into two parts, the first treating the subject quali- 

 tatively, the second quantitatively, while appended is a bibliog- 

 raphy of water examinations, both from the chemical and bio- 

 logical standpoint. These two fields of research, chemical and 



biological, are each given their proper place throughout the vol- 

 ume, and, more fairly than is usually the case, the author believes 

 them of equal value when in conjunction with a study of environ- 

 ment, and equally valueless when used alone. It has become a 

 habit among biologists, latterly, to decry chemical methods alto- 

 gether, while chemists, in their turn, have been rabid in their 

 defence, hence the stand taken by Mr. Rafter is particularly re- 

 freshing, and the more so that be is eminently a biologist, and has 

 arrived at his conclusions through calm reasoning. C. P. 



AMONG THE PUBLISHERS. 



We have received from D. Appleton & Co., their "Guide 

 Book to Alaska and the Northwest Coast," prepared by Eliza R. 

 Scidmore. It gives a quite minute description of the whole coast 

 of North America, from the Strait of San Juan de Fuca to the 

 Aleutian Islands, with brief notice of the more northern portions 

 of the great Alaskan peninsula. Though written for tourists, it 

 is by no means confined to the superficial aspects of the country, 

 but gives attention to the geographical features, the industries 

 and commerce, the mountains and glaciers and the native tribes 

 presenting a larger amount of information than might be expect- 

 ed in a book of one hundred and fifty pages. Such a book is 

 necessarily a compilation from various sources; but the author 

 has evidently studied the best authorities, and has supplemented 

 them by her own observations. The country described has cer- 

 tain special attractions for tourists, especially those of scientific 

 proclivities, since the geological formations, the flora and the 

 native inhabitants present some remarkable peculiarities. Many 

 scientific observers, as well as other tourists, have already visited 

 the region, especially its southern part; yet even now it is so lit- 

 tle known that visitors who wish to see as much as possible there 

 will find a guide-book indispensable. To such persons, therefore 

 this handy volume, which is well illustrated with maps and pict- 

 ures, cannot fail to be useful. 



ATonk 



For Brain-Workers, the Weak and 

 Debilitated. 



Horsford's Acid Phosphate 



is without exception the Best 

 Remedy for relieving Mental 

 and Nervous Exhaustion ; and 

 where the system has become 

 debilitated by disease, it acts as 

 a general tonic and vitalizer, 

 affording sustenance to both 

 brain and body. 



Dr. J. C. Wilson, Philadelphia, Pa., 

 says: " I have used it as a general tonic, 

 and in particular in the debility and 

 dyspepsia of overworked men, with sat- 

 isfactory results." 



Descriptive pamphlet free. 

 Rumford Chemical Works. Providence, R. I. 



Beware of Substitutes and Imitations. 



Exchanges. 



[Freeof charge to all, if ofsatisfactory character 

 Address N. D. C. Hodges, 874 Broadway, New York.l 



I wish to exchange a collection of 7,000 shells, 

 lOi 1 species and varieties, American and foreign, 

 land, fluviatile and marine, for a good microscope 

 and accessories. Address, with particulars, Dr. 

 Lorenzo Q. Yates, Santa Barbara, California. 



For exchange. — I wish to exchange Lepidoptera of 

 South Dakota and other sections, for Lepidoptera 

 of the world. Will purchase species of North Amer- 

 ica. Correspondence solicited, particularly with 

 collectors in the Rooky Mountains, Pacific coast 

 and Hudson's Bay regions. P. C. Truman, Volga, 

 Brooking county, South Dakota. 



For sale. — "Wheatstone Bridge wire, made to 

 order, new and unused. Price, $10. W. A. Kobhe, 

 Fortress Monroe, Va. 



For sale or exchange. — One latest complete edi- 

 tion of Watt's Dictionary of Chemistry, in fair con- 

 dition; one thirty volume edition (9th) of Allen's 

 Encyclopaadia Britannica, almost new. Will sell 

 cheap for cash or will exchange for physical or 

 chemical apparatus. Address Prof. W. S. Leaven- 

 worth, Ripon College, Ripon, Wis. 



Exchange. — One celestial, one terrestrial globe, 

 one lunatettis and charts, celestial maps, diagrams 

 and ephemeris from 1830 to 1893, astronomical 

 works, all in good condition. Will sell cheap or ex- 

 change. Make offer. C. H. Van Dorn, 79 Nassau 

 St., New York. 



The Rev. A. C. Waghome, New Harbor. New- 

 foundland, wishes to sell collections of Newfound- 

 laud and Labrador plants, all named by competent 

 botanists. He is going on a missionary journey 

 along the Labrador coast, from the middle of July 

 till October, and in return for much needed aid to- 

 wards (Episcopal) Church purposes in that region, 

 will be glad to be of service to any botanists who 

 may write to him. Letters posted in the U. S. up 

 to July 1 will reach him at the above address, and 

 if posted later will be forwarded. 



For exchange— I wish to exchange cabinet skins 

 of Californian birds or mammals for any book on 

 the following list, books if second-hand to be in 

 good order. Manual of Vertebrates, fifth edition. 

 D. S. Jordan; Nests and Eggs of North American 

 Birds, Oliver Davie; Marine Mammals of the West 

 Coast of North America, C. M. Scammon; The 

 United States and Mexican Boundary Survey. Vol. 

 II„ Zoology. S. F. Baird. F. Stephens, Witch Creek, 

 San Diego Co., Cal. 



Minerals for exchange — John Holl. Rollo, Wil- 

 mington, Delaware. 



Wants. 



AN experienced teacher in general biology wishes 

 a position in a flrst-class college or university 

 Three years in post-graduate study. Extensive 

 experience. Strong indorsements. Address E W 

 Doran, Ph,D,, 1327 B St., N. W,, Washington, D.' C, ' 



THREE teachers wanted for a male and female 

 seminary in central New York, Typewriting, 

 etc. languages, mathematics, sciences, et. al. Send 

 stamp with and for particulars. Box 701, Hemp- 

 stead, L, I. 



A ZOOLOGICAL collector and taxidermist of ten 

 years' experience in the field is now open to en- 

 gagement, for either field or laboratory work 

 References furnished. Address Taxidermist, Box 

 75, White Sulphur Springs, West Va. 



WANTED,— A set of Allen's Commercial Organic 

 Analysis, 4 vols. Vols, I. and II. particularly 

 desired. Condition not important, all leaves being 

 present and in place. Address Charles Piatt, 34 

 Lewis Block, Buffalo, 



WANTED, — Second-hand copy of Ehrenberg's 

 Radiolaria, Berlin. 1875. Selected diatom 

 slides, cash or both in exchange. D. C. Lewis, M.D. 

 Skaneateles, N. Y. 



WANTED, as principal of a flourishing technical 

 school, a gentleman of education and experi- 

 ence who will be capable of supervising both me- 

 chanical and common school instruction. Special 

 familiarity with some technical branch desirable. 

 Address, giving age, qualifications, etc., J. B. Bloom- 

 ingdale. Fifty-ninth street and Third avenue, N Y 



WANTED,— A young man as assistant in our 

 microscopical department. Queen & Co,, 

 Philadelphia, 



THE undersigned desires specimens of North 

 American Gallinae in the flesh for the study of 

 their pterylosis. These species are especially de- 

 sired: CoUnxis ridgu-ayi, cijrtonyx montezumae, 

 deuclragapusfrankliniJaaopiiswelchiJi/mpanuchus 

 cupido &nd pedioeceiesphasianellu^. Any persona 

 having alcoholic specimens which they are willing 

 to loan or who can obtain specimens of any of the 

 above are requested to communicate with Hubert 

 Lyman Clark, Sgg-J Fifth Avenue, Pittsburgh. Pa. 



A COMPETENT TEACHER of botany in college 

 ot university is open to engagement. Address 

 L., Box 86, Rochester, Mich. 



