The Journal of the College of Science, Imperial University of Tokyo, Japan = Tokyo Teikoku Daigaku kiyo. Rika

"^^ iü wfeIS5P teW Ä «ft-K THE JOURNAL OF THE COLLEGE OE SCIENCE, IMPERIAL UNIVERSITY OF TOKYO, Vol. XXV. ^-m M © ::^ ^ PP ^f PUBLISHED BY THE UNIVERSITY TOKYO, JAPAN. 1908. MEIJI XLI.Publishing Committee. -x^ Prof. LL. D., Rigakuhakushi, Director of the College, {exSakurai, officio).J. Prof. Ph. D., Rigakuhakushi.Ijima,I. Prof. Omori, Rigakuhakushi.F. Prof. Ph. D., Rigakuhakushi.S. Watasé, £lS7 0) 2 7'/ X—— CONTENTS. Y. Osaka.1, By —Publ.Art. On the inversion of cane sugar. 18th,September 1908. Matsui.—By M. Publ. Sep-Art. 2.—The complex ferri-malonates. 18th,tember 1908. 3.Art. —On the constitution of the so-called elaeomargaric acid. By T. Ka.metaka.—September I8th, 1908. 4. By T. Kametaka.—Publ.Art. —Notes on Japanese vegetable oils. September 18th, 1908. 5. By T,Art. —On the viscosity of dilute alcoholic solutions. HiRATA.—Publ September 18th, 1908. 6. ByArt. —TJeber den Hauptbestandteil des japanischen Lacks. R. Majima and S. Oho.—Publ. September 18th, 1908. 7. Ueber die Anomalie der starken einwertigen Elektrolyte.Art. — By M. Katayama.—Publ. September 18th, 1908. 8. Coagulation of colloidal aluminium hydroxide by elec-Art. By S. Kawamura.—Publ. September 18th, 1908.trolytes. By G.partition of silver between zinc and lead.Art. 9.—On the PoTDAii.—Publ. September 18th, 1908.N. By K.10. theory of solutions. I.Art. —Studies on the chemical Ikeda.—Publ. September 18th, 1908. 11. of the system naphthalene-phenol.Art. —The fusion curves By Yamamoto.—Publ. September 18th, 1908.{With 1 plate). T. 12. surfaces of the system naphthalene-Art. —On the fusion molecular association ofchlorobenzene-phenol and the Hirobe.—Publ. Sept. 18th, 1908.{With 2 plates). By H.phenol. 13.Art. —A simple method of preparing the imides of the aromatic 18th,By T. Haga.—Publ. September 1908.sulphonic acids. Art. 14.—The oximes and imides of benzenedisulphonic acids. By T. Suzuki.—Publ. September I8th,^1908. By15.Art. —Preliminary note on a new element in thorianite. Publ. September 18th,M. Ogawa.— 1908. 16. allied molyb-Art. — note on a new element to Publ. 18th,By M. Ogawa.— September 1908.denum. Art. 17.—Formation of -oxycarbostyril from o-nitrobenzoylacetic; 3Iatsubara.—Publ. September 18th, 1908.By K.acid. ByArt. 18.—Molecular rearrangement of N-benzylbenzaldoxime. 31. KuHARA.—Publ. September 18th, 1908. {With Al plates). By B. Hayata.Art. 19.—Flora montana formosae. —Publ. July 2.3rd, 1908. "PRINTED AT THE TOKYO TSUKIJI TYPE FOUNDRY."THE SOIESCE, IMPERIAL UNIVERSITY,JOURNAL OF COLLEGE OF TOKYO, JAPAN, 1.VOL. XXV., ARTICLE of Cane Sugar.On the Inversion By RigakuhahusM.Yukichi Osaka, that634 1898.) has shownHill (Journ. Chem. Soc. ;73, action of an enzymehydrolysis of maltose by the catalyticthe degree of hydrolysis, theand that the less theis incomplete inversion of caneis the solution. As to themore concentrated ex-of an acid, it has been studiedsugar by the catalytic action of view and it is well known thattensively from several points improbable, thatthe hydrolysis is complete. It is not, however, some measure incom-of cane sugar may also be inthe In this respectis highly concentrated.plete when the solution caneof the inversion ofI have undertaken the investigation in the followingobtained the results expected, as shownsugar and communication. purified by precipitationPure commercial cane sugar was solution with absolute alcoholthe cold saturated aqueousfrom the calculationwith etlier. The experiments andand washing it carried out as follows :of the results were c.c.(jyams cane sugar in 10080 ofI. ion.the sohltof weighedwere introduced into aof cane sugar20 grams dissolved in a small25 c.c. capacity andmeasuring flask of— 1.ART. Y. OSAKA I2 2.5quantity of water by warming. When it was cold, 5 c.c. of normal liydroehloric acid were added and the solution was diluted mark. small piece of camphor was then addednearly to the A 25°left in thermostat at overto the solution and the flask a 25° thenight. On the next day water at was added to mark and weighed. The two solutions thus prepared weighed : (a) 32.799; mean: 32.793.32.787, ib) from each ofAbout 5 c.c. of the solution were taken out capacitythe solution into two weighed measuring flasks of 25 c.c. and weighed. About 4 c.c. of 2.5 norm, hydrochloric acid were added to them and the solutions were diluted to abouteach of prepared, together with20 c.c. The four diluted solutions thus the two original solutions, were again left in the thermostat over night. On the next 5 of the two original solutionsday about c.c. were taken out, each into two weighed measuring flasks of 25 c.c. capacity, and weighed. Tn order to prevent its further of acetate added toinversion on dilution, 3.4 grams sodium were the solutions taken out, which were then diluted to the mark. The same amount of the salt was also introduced into each of solutions day make themthe diluted the previous to as nearly as possible similar to those newly j^repared and then the solutions were further diluted to the mark. It was ascertained by ex23eri- ments that a small difference in the concentrations of hydro- remarkable on the optical rotationchloric acid exerts no influence of sugar solutions. The eight dilute solutions thus prepared were then subjected to Polarimetrie observations, a polarisation apparatus after Landolt being used with a Lippich's polariser.