SCIENCE. 



[Vol. XVll. No. 450 



CALENDAR OF SOCIETIES. 



Philosophical Society, Washington. 



April 25. — Od the Characteristic Radiate 

 Growth in Acid Lavas (illustrated by speci- 

 mens); Whitman Cross, Constitution and 

 Origin of Spherulites; J. P. Iddings, 

 Spherulitic Chrystallization in Obsidian; R. 

 S. Woodward, A Review of Tisserand's 

 "Traite de Meoanique C61este." 



New York Academy of Sciences. 

 April 27. — Henry M. Parkhurst, Stellar 

 Photometry. 



A NEW MONTHLY 



THE INTERNATIONAL 



JOURNAL OF MICROSCOPY AND 



NATURAL SCIENCE. 



THE JOURNAL OF THE 



POSTAL MICROSCOPICAL AND WESLEY 



NATURALISTS' SOCIETIES. 



Edited by ALFRED ALLEN and Rev. 



WILLIAM SPIERS. 



CONTENTS OF APRIL NUMBER: 



Notes on the Anatomy of the Ciciudela-Sex- 



^ttata. 

 Infusoria, Protozoa, etc.— Practical Methods 



of Preparation. 

 Birds' Nests and Plants on Telegraph Lines. 

 Aspect of the Heavens — April, 1891. 

 A Protest against Indiscriminate Collecting. 

 Color Photography. 

 Mason' s Improved Oxy-hydrogen Lantern and 



Table Microscope. 

 Science Jottings. 



Cotton in the Holy Land. 



Cuba breaking in Two. 



Grafting Human Skin. 



Limit of Magnification for Photo-Microg- 

 raphy. 



Death of Dr. Brady, F.E.S. 



Condenser for the Microscope. 



Dormant Buds in Woody Dicotyledons. 



Examination of Infusoria. 



Examination of Drinking Water. 



The Annihilation of Smoke. 



Boiler-Cleaning. 



Cure for Lock- Jaw. 

 Collectors' Notes for April. 

 Correspondence. 

 Parasite in Vaucheria. 

 Local Societies. 

 Reviews. 



$1 .75 Per Year. 



To Science subscribers, $1.00 for one year. 

 " " " 50 cents for six mos. 



N. D. C. HODGES, 



47 LAFAYETTE PLACE, 

 ISTE^^^ YORK. 



Wa7tts. 



A 7iy person seeking apposition for 'which he is quali- 

 fied by his scientific attainments^ or any person seeking 

 some one to fill a position of this character^ be it that 

 of a teacher of science^ chemist^ dratcghtsman^ or what 

 not. may have the ' Wa7it ' inserted under this head 

 ^REE OF COST, if he satisfies the publisher of the suit- 

 ible character of his application. A ny person seeking 

 'nformation on any scientific question^ the address of 

 any scientific man, or who can in any way use this col- 

 t for a purpose consonant with the nature of the 

 ?r, is cordially invited to do so. 



WANTED.— Vols. I and II. o£ Allen's "Commercial 

 Organic Analysis." Science Book Agency, 

 47 Lafayette Place, New York. 



THERE is an opening in this ofBce for a college 

 graduate with scientific tastes. Science, 47 

 Lafayette Place, New York. 



WANTED— A situation in an Analytical Labora- 

 tory during the summer vacation. Can give 

 good references. Address M. ADGATE, North Col- 

 lege, Burlington, Vt. 



WANTED— A position in some College, Normal 

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 ogy, Comparative Anatomy, Histology, Embryology 

 or Botany. A graduate of the University of Wisoon- 



sin. Have had four years' experience i * ''"- 



Address "BIOLOGIST," care Science, 



, teacher. 



WANTED.— All of Vol. I. of Journal of Analytical 

 Chemistry, published at Easton, Penn. State 

 price and condition. Science Book Agency, 47 

 Lafayette Place. New York. 



WANTED— A position in a Summer School of 

 Gymnastics to teach any one or more of the 

 following named physical exercises, viz.: Fencing 

 (to ladies especially), Sparring, Club Swinging, 

 Wands, Chest Weights and Free Movements. Am 

 prepared to oiler very favorable terms to any school 

 desiring such work. WILLIAM FINDLAY, Propri- 

 etor of Phila. Inst, of Phys. Cult., 1009 Arch Street, 

 Philadelphia, Pa 



A HARVARD M A., especially interested in Nat- 

 ural History, would like to learn of some out- 

 door occupation" for the summer. Remuneration a 

 secondary object. SUMMER, Science Office. 



A CHEMIST, taking P. G. work in the Scientific 

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 like to negotiate for some industrial position, where 

 his knowledge would be of avail. Can furnish best 

 of references. R. S. W., Box 691, Amherst, Mass. 



WANTED— A position to teach Electrical Engi- 

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WANTED.— A young man in college would like a 

 position during the summer of 1891 in some 

 scientific work, particularly Orinthology, either as 

 an instructor or tutor, or in making collections or 

 accompanying some scientific expedition. Can give 

 good references. Address HUBERT L. CLARK, 

 Amherst, Mass. 



Exchanges. 



[Free of charge to all, if of satisfactory character. 

 Address N. D. C. Hodges, 47 Lafayette Place, New 

 York.l 



Will exchange a new Thomson reflecting astatic gal- 

 vanometer, about 6,000 ohms, made by Clark, Muir- 

 head & Co , London, and costing £30, with i-g, 1-99, 

 i-ggg, shunts, lampand Pscale, for a Weston voltmeter 

 and ammeter, or arge Wheatstone bridge, dial pattern, 

 or a portable testing outfit. Address G. A., Science 

 Oflice, 47 Lafayette Place, New York. 



For exchange — Fossil leaves from the Laramie beds of 

 South Table Mountain, near Golden, Col., for other fos- 

 sils, historical relics, or minerals. Address John B. Gar- 

 vin, State School of Mines, Golden, Col. 



For Sale or E.xchange — All forms and species of Cana- 

 dian birds, mammals, insects, reptiles, fish or other nat- 

 ural history specimens. First class specimens only sup- 

 phed. G. E, Atkinson, 639 Spadina Ave., Toronto, Can. 



1 would like to exchange first six vols. Roscoe and 

 Schorleminer's Chemistry, and Vols. II. and III. of " Ed- 

 ucation " for American Naturalist for i88g and iSgo, or 

 works on Zoology. 0. Dwight Marsh, Ripon College, 

 Ripon, Wis, 



I have a good supply of Eastern Coleoptera which I 

 wish to exchange for species not in my collection. Mel- 

 andryidae and Oedemeridae especially desired. Joe C. 

 Thompson, Rosebank P. O., Box 73, S. I. 



Of Pure Cod Liver Oil with 



Hypophosphites 



Of Lime and Soda. 



There are emulsions and enitilsions, ] 

 I and there is still much shitumed tnilJc \ 

 •which masquerades as cream. Try i 

 they will 7nany manufacturers cannot ] 

 so disguise their cod liver oil ^ as to 7nake 

 it palatable to spnsitive stovnacJis. Scott's I 

 , Emulsion of rURIS NORWEGIAN COD j 

 , LIVER OILf co7nhined with Hi/pophos- | 

 j pliitcs is almost as palatable as milk, i 

 I Eor this reason as ivell as for the fact \ 

 I of the stiimdatinff qitnlities of the Hypo- \ 

 \ phospJiiies, I^hysirians /requently pre- 

 \ scribe it in cases of 



COHSHMPTIOH, 



SCROFULA, SRONCHljClS and 

 CHRONIC COVGa or SEVJERX! COLU. 

 All Drugr/isfs sell it, but he sure yon get 1 

 the genuine, as there ai-e poor imliatio' 



Protection from Lightning 



SPARE THE ROD AND SPOIL THE HOUSE ! 



To dissipate the energy of a lightning dis- 

 charge, — to prevent its doing harm, — it is 

 necessary that something should be placed in 

 its path upon which its energy (capacity for 

 causing damage) may be expended. The 

 Patent Lightning Dissipater is specially de- 

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 sent prepaid, with full directions for its ap- 

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 previously taken by agents, on receipt of $5.00. 



Correspondence solicited. 



AGENTS WANTED. 



N. D. C. HODGES, 



47 Lafayette Place, N. Y. 



THg DOLLAR TYPEWRITEB 



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 E. II. INGERSOLL&BKO., 60COKIIANDTST., M.Y. CITY. 



Iflinerals, 



Rocks, 



Fossils, 



Casts of Fossils, 



Oeological 



Relief Maps. 



Ward'sNaturalScienceEstablishment 



Mineralogy, Geology, Paleontology, Zoology, Osteology, Anatomy. 



Send for Circular. ROCHESTER, N. Y. 



StufTed Animals 



and Skins, 



Mounted 



Skeletons, 



Anatomical 



Models^ 



Invertebrates. 



