748 
REPORT OF THE AUTUMN MEETING 
Walter B. Cannon, Harvard University: *Oscillatory variations in the contraction of 
rhythmically stimulated muscles. 
Wm. H. Dall, Smithsonian Institution: *0n some anomalies in the distribution of Pacific 
coast mollusca. 
G. H. Parker, Harvard University: *The responses of hydroids to gravity. 
W. M. Wheeler, Harvard University: *The phylogenetic development of subapterous 
and apterous castes in the Formicidae. 
W. J. Cro-^ier, Resident Naturalist, Bermuda Biological Station (introduced by E. L. 
Mark): *0n cell penetration by acids: the chloracetic acids. *0n the immunity coloration 
of some nudibranches. 
Hovey Jordan, Bermuda Biological Station (introduced by E. L. Mark): *The rheo- 
tropism of the marine fish known as "hamlet" or "grouper" {Epenephalus striatus). 
A. C. Walton, Harvard University (introduced by E. L. Mark): *The occurrence of 
Ascaris triquetra, Schrank, in dogs. 
The following is the list of scientific exhibits prepared for the meeting of the 
Academy. 
H. S. White, Vassar College: Graphic representations of triad systems. 
Miss A. J. Cannon, Harvard College Observatory: Stellar spectra. 
Leon C ami bell. Harvard College Observatory: Visual observation of variable stars. 
Miss H. S. Leavitt, Harvard College Observatory: Photographic magnitudes. 
Solon I. Bailey, Harvard College Observatory: Variable stars in clusters. 
A. G. Webster, Clark University: Acoustical measuring apparatus: standard phone, 
phonometer and phonotrope. Application of a drop chronograph for use in ballistics. 
Charles A. Kraus, Clark University: A new vacuum pump and a new thermostat. 
H. P. Hollnagel, Mass. Inst. Technology: Methods of isolating the infra-red region 
of the spectrum. 
Alexander McAdie, Blue Hill Observatory: Cloud studies, wind structure and snow 
flakes. 
Ellsworth Huntington, Milton, Mass. : The relation between solar changes and baro- 
metric gradients. Optimum temperature for the human race. 
Robert DeC. Ward, Harvard University: Weather ty^QS of the United States, illus- 
trated by composite weather maps and instrumental records. 
R. A. Daly and H. Clark, Harvard University: Design for a deep-sea thermograph. 
Frank Hall, Mass. Inst. Technology: A thermophone arranged so that direct com- 
parison may be made with a magnetic receiver. 
A. H. Gill, Mass. Inst. Technology: Tests of lubricating mineral oils. 
F. G. Keyes and J. B. Dickson, Mass. Inst. Technology: Continuous flow calorimeter 
for measuring heats of reaction in solution. 
C. L. BuRDiCK, Mass. Inst. Technology: Determination of crystal structure by X rays. 
R. E. Wilson, Mass. Inst. Technology: Apparatus for maintaining pressures of one- 
tenth micron or less, and the investigation of the mechanism of chemical reactions. 
Henry Fay, Mass. Inst. Technology: Erosion of large guns. 
Albert Sauveur, Mass. Inst. Technology and Harvard University: 1. Photomicro- 
graphic apparatus (original). 2. Photomicrographs of metals and alloys; charts and dia- 
grams; specimens. 
H. O. HoFMAN, Mass. Inst. Technology: 1. Jenny flotation machine. 2. A laboratory 
revolving horizontal roasting furnace heated electrically and rotated in the same way. 
A. E. Kennelly and Associates, Mass. Inst. Technology: Researches in electrical 
engineering. 
Alexander Klemin, Mass. Inst. Technology: Aeroplane models used in wind tunnel. 
W. Lindgren and W. L. Whitehead, Mass. Inst. Technology: Photomicrographs of 
silver ores from Chile and Tintic. 
