pletely broken down that he was obliged to give up his regular work. Then followed a weary chase after health. A journey to Europe that summer did no good, nor was he more fortunate in the next winter spent on leave of absence, or in the following summer. In the autumn of 1911, although no better, he took up his teaching again, for his physicians decided that, if work were forbidden, the longing for it would do him more harm than the work itself. Accordingly he began to lecture in spite of agonizing attacks of pain, giving us the spectacle of duty triumphing over suffering, as before it had led him to disregard his own ease and advantage; but this heroism was in vain, the attacks grew more frequent, until in the middle of the year lecturing became impossible; but even then, as before, he filled up every cranny of his life with work on his papers feeling that rest was impossible, while anything remained undone, until death found him working at his post on February 25, 1912. The faithfulness, which had moulded every action of his life, reached a fitting climax in the heroic devotion to duty to its close.

C. L. JACKSON.

Chemical Papers of C. R. Sanger.

Ueber die Einwirkung von salpetrigsauren Kali auf die Mucobromsäure. With Henry B. Hill. Ber. d. deutsch. chem. Gesell., 15, 1906 (1882).

Brompyromucic Acids. With Henry B. Hill. Proc. Amer. Acad., 21, 135 (1884).

Ueber substituirte Brenzschleimsäuren. With Henry B. Hill. Ann. Chem. Pharm., 232, 43. (1885).

The Quantitative Determination of Arsenic by the Berzelius-Marsh Process, especially as applied to the Analysis of Wall Papers and Fabrics. Proc. Amer. Acad., 26, 24 (1891). Amer. Chem. Journ., 13, 431 (1891).

The Chemical Analysis of three Guns at the U. S. Naval Academy captured in Corea by Rear Admiral John Rodgers, U. S. N. Proc. U. S. Naval Institute, 19, 53 (1892).

On the Formation of volatile Compounds of Arsenic from Arsenical Wall Papers. Proc. Amer. Acad., 29, 112 (1894).

On Chronic Arsenical Poisoning from Wall Papers and Fabrics. Ibid., 29, 148 (1894).

The Determination of Small Amounts of Antimony by the Berzelius-Marsh Process. With James Andrew Gibson. Ibid., 42. 717 (1907).

The Quantitative Determination of Arsenic by the Guthzeit Method. With Otis Fisher Black. Ibid., 43, 295, (1907).

The Determination of Arsenic in Urine. With Otis Fisher Black. Ibid., 43, 325 (1907).

The Quantitative Determination of Antimony by the Guthzeit Method. With Emile Raymond Riegel. Ibid., 45, 19 (1909).

Pyrosulphuryl Chloride and Chlorsulphonic Acid. With Emile Raymond Riegel. Ibid., 47, 671 (1912).

The Action of Sulphur Trioxide on Silicon Tetrachloride. With Emile Raymond Riegel. Ibid., 48, 573 (1913).

Other Publications of C. R. Sanger.

Logarithms of Numbers and Chemical Factors. Edited. Cambridge, Mass. The editor, 1881; 5th Edition revised, Harvard University Publication Office, 1901.

Laboratory Experiments in General Chemistry. St. Louis, Mo., The Author, 1896.

A Short Course of Experiments in General Chemistry with Notes on Qualitative Analysis. St. Louis, Mo., The Author, 1896.

Notes in "Chemistry 3" (qualitative analysis). Harvard University Publication Office, 1901; 2nd edition. Ibid., 1903.

Henry Barker Hill, Memoir. Harv. Grad. Mag., 12, 43 (1903).

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(Number limited to six hundred.)

CLASS I. Mathematical and Physical Sciences.- 143.

SECTION I.-Mathematics and Astronomy.-34.