DEC. 4, 1923 PROCEEDINGS: WASHINGTON ACADEMY OF SCIENCES 443 
The specific name is derived from Cuscatldin, the aborginal name of the 
Valley of San Salvador and of its principal city. 
Amerimnon melanocardium (Pittier) Standl. 
Dalbergia: melanocardium Pittier, Journ. Washington Acad. Sci. 12: 57. 
1922. 
The type of this species was collected in the Department of Santa Rosa, 
Guatemala. It has been recollected recently at Santa Tecla, Salvador, by 
Dr. Salvador Calderén (no. 1517), who reports the vernacular name as 
chapulaltapa, a name applied -in Salvador to several leguminous trees of 
various genera. 
PROCEEDINGS OF THE ACADEMY AND AFFILIATED 
SOCIETIES 
WASHINGTON ACADEMY OF SCIENCES 
176TH MEETING 
The 176th meeting of the Acapemy was held jointly with the Geological 
Society of Washington, the Biological Society of Washington, and the Botani- 
cal Society of Washington in the Auditorium of the Interior Building, the 
evening of Wednesday, March 14, 1923. The evening was devoted to a 
sympos'um upon The fossil swamp deposit at the Walker Hotel site, Connecti- 
cut Avenue and De Sales Street, Washington, D. C. The program was as 
follows: 
C. K. WentwortH. The geologic relations. (Read with supplemental 
remarks by L. W. STEPHENSON.) 
E. Brown, Department of Agriculture. Seeds and other plant remains. 
(Presented by FREDERICK V. CovVILLE.) 
E. W. Berry, Johns Hopkins University. The plant remains and their 
significance. 
ALBERT MAnn, Carnegie Institution. The remarkable fresh water diatom 
flora from the swamp deposit, and its significance. 
LAURENCE LA Foren. The physiographic relations of the swamp deposit. 
These addresses will be published in full in the JourNnat of the Washington 
Academy of Sciences. 
177TH MEETING 
The 177th meeting of the AcaApEmMy was held jointly with the Philo- 
sophical Society of Washington, the Washington Society of Engineers, and the 
American Society for Steel Treating, in the Auditorium of the Interior Build- 
ing, the evening of Saturday, March 31, 1923. Dr. Water RosENnuHaIn, 
F. R.8., of the National Physical Laboratory, England, delivered an address 
entitled, The structure and constitution of alloys. 
Dr. RosENHAIN discussed the general theory of the constitution of ferrous 
and non-ferrous alloys, the construction of constitutional diagrams which 
represent graphically the transformations that occur in a metal or an alloy 
on cooling or heating, their interpretation and relation to the physical prop- 
erties of alloys. Lantern slides of typical constitutional diagrams were shown 
and discussed. The question of laboratory equipment for the study of the 
structure and physical properties of alloys was next considered, and many 
interesting photographs and diagrams were shown of apparatus developed 
