CHEMISTRY — BANCROFT, BAXTER. 209 



Ueber die Quantitative Bestimmung von Diasoalkylen. By E. K. Marshall, 

 jr., and S. F. Acree. (Berichte d. d. Chem. Ges., 43, p. 2323.) — Mr. Marshall 

 has worked out an accurate method for analyzing a solution of diazoalkyls. 

 none having existed for these organic compounds. 



Bancroft, W. D., Cornell University, Ithaca, New York. Grant No. 609. 

 Systematic study of alloys. (For previous reports see Year Books Nos. 

 2-8.) $1,500 



Owing to the failure to obtain a suitable temperature-regulator and to the 

 delay in obtaining a suitable temperature-recorder, no thermometric measure- 

 ments have yet been made upon the iron-carbon alloys. The microscopic 

 examination is practically finished and much time has been spent in collating 

 work of other investigators; when properly interpreted this other work con- 

 firms the conclusions drawn from the present investigation in an extremely 

 satisfactory manner. There seems good reason to suppose that the substance 

 which crystallizes from the melt is 8 iron and not 7 iron, as usually supposed. 

 It is now sought to determine the limits of the 8 and the y fields. The copper- 

 tin diagram has been finished. One of the two unexplained heat-changes 

 has been shown to be due to the presence of free tin where it did not belong. 

 Annealing for three months at 210° removed this. The other heat change at 

 188° has been shown to be due to a second modification of the t phase. 



The work on the tensile strength of the zinc-aluminum alloys has been 

 finished. It was previously reported that the tendency of certain of these 

 alloys to break down was due to the formation of a new phase of unknown 

 composition, but further investigation shows that the trouble is due to the 

 action of furnace gases on the melt. 



An extended investigation has been made on the electrolytic corrosion of 

 copper, tin, nickel, cadmium, zinc, and iron. The corresponding chemical 

 corrosions are only partially finished ; but it is believed that this work will be 

 completed before the end of the winter. 



Baxter, Gregory P., Harvard University, Cambridge, Mass. Grant No. 

 623. Determination of atomic weights. (For previous reports see 

 Year Books Nos. 3-8.) $1,000 



With the assistance of the above grant the following researches were car- 

 ried on under Professor Baxter's direction: 



The investigation upon the atomic weights of silver and iodine through the 

 analysis of iodine pentoxide (recently published; see Year Book No. 7, pp. 

 189—192) was continued by new determinations of the ratio of silver to 

 iodine. Since the percentage of iodine in the pentoxide is obtained by multi- 

 plying the ratio of silver to iodine pentoxide by the ratio of iodine to silver, it 

 seemed highly desirable to investigate the latter ratio by as nearly as possible 

 the same method as that used in determining the former ratio. This method 

 consisted in the titration, at very high dilution, of the solutions of weighed 



14 — YB 



