DURING the past 12 months we have been engaged in investigating some new points in connection with the structure and chemistry of flames. The investigation, which at first proceeded rapidly, has latterly become more complex and difficult, and much more work is demanded for the complete solution of the problems that have arisen. We fully intended t o delay the publication of our results until material for a complete memoir had been accumulated, especially as we believed ourselves to be working in an obscure corner of the subject. But in the Journal fiir praktische Chernie, 44, 246, there appeared a paper LLZur Kennzeichnung dep Flamme," by N. Tech, which was first brought to our notice by an abstract in this Journal (1891, 1309), and the paper gives a description of the very phenomenon which served as the starting point of our experiments. The author also, in a footnote, reserves to himself the investigation of the field to which this phenomenon opens the way. As the phenomenon in question was observed by one of us three or four years ago, and has indeed been since shown as a lecture experiment, and as we have been so long engaged in working out the points suggested by it: we feel compelled

8CIEN1'U"IC AMERICAN SUPPLEMENT, No. 846. MAIWTI 19, 189�.the oxygen of the air more than necessary. Of the when burnt with its own volume of oxygen, gives pro filtrate we take exactly 25 c. c. to test its permanence ducts represented in the equation CH, + 0, = CO + in gla88. 25 c. c. are let flow into a clean and dry bot-H,O + H2. But as the two substances, CO and H,O, tIe holdin� 500 c. c. It sho . uld ?e of a cylipdrical form, act upon one another, CO + H20 �C03 + H., the malion about Patents and how to procure them; direction. (' oncerning com us IOn of the O . and H. WIth �he external Those who are enga ed in any branch of industry air .. . These results are m harmo�y WIth the con� probably will find in th1s book much that is of prac-Labels, Copyrights, Designs, Patents, Appeals, Reissues, Infringements, elUSIOnS of Blochma�n, and WIth the work o f tical value in their respective callings. Assi�nments, Rejected Cases. Hmts on the Sale of Patents, etc. D!1lton on th� eXpIOSI?J? of . metha . ne and ethylene Those who are in search of independent business or We al.o send, free Of charge, a Synopsis of Foreign Patent Laws, show WIth oxygen m quantItieS m . suffiCIent for complete e m ployment, relating to the manufacture and sale ofing th e cost and method of securing patents in all the principal countries � ombustlOn. The authors pomt out: (1) ,!hat, even useful articles, will find in it hundreds of most excel-of the world.

SINCE the discovery of the primary and secondary hydrazines, they have become of such importance as synthetic agents, and the results to which their employment has led have been of such magnitude that other substituted derivatives of bydrazine have been but little studied. Theoretically, hydrazine can yield five series of substituted derivatives, the primary, secondary, symnietrical and unsymmetrical, tertiary, and the quaternarp.

No abstract