948 
Choletcytitis with Observations on Gall Stone 
Formation,’ by J. H. Pratt. 
The Popular Science Monthly for June opens 
with a timely article on ‘Our Forest Reserva- 
tions,’ by J. W. Toumey, in which the subject 
is discussed from various points of view. David 
Starr Jordan presents the second instalment of 
‘The Blood of the Nation,’ showing how the 
slaughter of the flower of the nation in war 
contributes to the survival of the unfit, and 
Robert H. Thurston gives the concluding por- 
tion of his paper on ‘ Progress and Tendency 
of Mechanical Engineering in the Nineteenth 
Century.’ Jas. Lewis Howe discusses ‘The 
Periodic Law,’ and Henry A. Rowland’s ‘A 
Plea for Pure Science,’ is republished as a tribute 
to his memory, while Gary N. Calkins treats at 
some length of ‘The Malaria Germ and Allied 
Forms of Sporozoa.’ Francis H. Herrick has 
a well-illustrated article on ‘The Wild Bird at 
Arm’s Length ; A New Method of Bird Study,’ 
this consisting in removing the branch to which 
a nest with young birds is attached to some 
accessible spot near by a green tent, from which 
‘the birds are observed and photographed at a 
short distance. The final article is the sixth 
portion of ‘ A Study of British Genius,’ by 
Havelock Ellis, this being devoted to marriage 
and family. 
Bird-Lore for May—June opens with an article 
by John Burroughs on ‘A Bewildered Pheebe,’ 
followed by ‘ Bird-Nesting with Burroughs,’ by 
Frank M. Chapman, well illustrated from pho- 
tographs. Annie Trumbull Slosson contributes 
‘A Sudden Friendship,’ showing how tame 
wild birds may suddenly become. The fourth 
series of ‘ Birds and Seasons’ treats of the forms 
to be observed’ from Boston to Stockton, Cal., 
incidentally including the statement that Dr. 
W. L. Ralph is to continue the ‘ Life Histories 
of North American Birds’ which was begun by 
the late Major Bendire. Among the various 
articles in the different ‘departments’ is one 
of special interest entitled ‘A Connecticut Game 
Peserve,’ by Willard G. Van Name, which 
hints at a successful method of increasing the 
birds by making a reservation where they are 
protected at all seasons and fed during winter 
and whence they spread into adjacent terri- 
tory. 
SCIENCE. 
(N.S. Vou. XIII. No. 337. 
SOCIETIES AND ACADEMIES. 
THE NEW YORK SECTION OF THE AMERICAN 
CHEMICAL SOCIETY. 
THE regular meeting of the New York Sec- 
tion of the American Chemical Society was held 
May 10th, at the Chemists’ Club, 108 West 55th 
Street, Dr. C. A. Doremus presiding. 
The following papers were read : 
“The Quantitative Determination of Cadmium,’ by 
E. H. Miller and R. W. Page. ; 
“On the Relation of Chemical Constitution to the 
Physiological Action of Certain Modern Anesthetics,’ 
by W. E. Dreyfus. 
“Alloys of Titanium and Titanium Steel’ by A. J. 
Rossi. 
(a) ‘Chemical Nature of the Enzymes,’ (b) ‘ Note 
on Nucleic Acid,’ by P. A. Levene, read by Dr. 8. 
Bookman. 
‘ Analysis of Garden Sage, with Notes on the De- 
termination of Essential Oils,’ by L. L. Watters. 
Each of the papers received some discussion. 
A communication was read from the chair- 
man of the New York Section of Chemical in- 
dustry, relative to the appointment by that 
body of a committee to secure ‘uniformity in 
technical analysis’; and stating that a sub- 
committee had been appointed to investigate 
the analysis of Portland Cement. Also that 
work on this line had commenced and that 
members of the New York Section of the 
American Chemical Society were invited to co- 
operate. 
It was moved and seconded that the matters 
be brought before the council with the recom- 
mendation that a committee be appointed to 
cooperate with the committee of the Society 
of Chemical Industry. — 
Tt was also voted that the chairman of the 
New York Section be returned as a loeal dele- 
gate to the council of the Society, provided he 
be not already a member of the council as 
delegate-at-large. 
DURAND WOODMAN, 
Secretary. 
DISCUSSION AND CORRESPONDENCE. 
THE MOTION OF A TOP. 
THE elementary explanations of this motion 
generally labor under the difficulty which at- 
tended the explanations of the late Professor 
Pliny Earle Chase, that is, they need an ex- 
