SERENO WATSON. 403 



taking Boiling-points (p. 15G). Mem. Amer. Acad., TX. 

 135. (11 Oct., 1864.) 



6. On a New Process for the Determination of Sulphur in Organic Com- 



pounds, by Combustion with Oxygen Gas and Peroxide of Lead. 

 Proc. Amer. Acad., VI. 472. (14 March, 1865.) 



7. On a New Process of Organic Elementary Analysis for Substan- 



ces containing Chlorine. Proc. Amer. Acad., VII. 84. (31 Jan., 

 1866.) 



8. Note on an Improved Apparatus for the Determination of Vapor 



Densities by Gay-Lussac's Method; being a Modification of Bun- 

 sen's Apparatus for measuring Aqueous Vapor. Proc. Amer. 

 Acad., VII. 99. (10 April, 1866.) 



9. Hydrocarbons of Pennsylvania Petroleum. American Journal of 



Science, 1868, (2d series,) XLV. 262. 



10. (Posthumous.) On the Volatile Hydrocarbons in Pennsylvania Pe- 



troleum. Proc. Amer. Acad., XXVII. 56. 



11. (Posthumous.) Note on a Criticism of the Author's Apparatus for 



Fractional Condensation. Proc. Amer. Acad., XXVII. 89. 



12. (With F. H. Storer.) Examination of a Hydrocarbon Naphtha, ob- 



tained from the Products of the Destructive Distillation of Lime- 

 soap. Mem. Amer. Acad., IX. 177. (9 Aug., 1865.) 



13. (With F. H. Storer.) Examination of Naphtha obtained from Ran- 



goon Petroleum. Mem. Amer. Acad., IX. 208. (9 Aug., 1865.) 



SERENO WATSON. 



Sereno Watson, a Fellow of this Academy, died at his home in 

 Cambridge on March 9, 1892. 



To most of his associates here he was known only as a regular 

 attendant at our meetings, and an occasional contributor to our Pro- 

 ceedings, presenting his communications, which were of a technical 

 character, by title. 



His co-laborers in Natural History recognized him as a critical 

 student in the department of Descriptive Phamogamic Botany, who 

 enriched our volumes by the results of work of a high order. 



Those who were engaged in neighboring fields of botanical investi- 

 gation knew him as a faithful friend of few words. He was observed 

 by them to carry on his researches in silence, seldom alluding to any 

 special task in hand until it drew near completion, and even then only 

 briefly. He was always ready to interrupt his studies to assist others 

 in theirs ; he would enter with unconcealed pleasure into the plans of 

 others, but without ever speaking of his own. 



Hence it happens that his intimate friends, when called upon to 



