NOTES. 127 
It is prevented from rolling off from the fine-adjustment wheel by 
a horizontal wire, transverse to the axis of the apparatus, attached 
by a hinge-joint to a post at the side of the plank, and to a pin 
in the end of the wooden rod which just passes through the cylin- 
der; and being retained not over the centre, but somewhat to one 
side of the wheel, loss of motion is simply impossible, and an ex- 
tremely fine and manageable motion is secured. The unequalled 
facility and certainty with which this apparatus can be instantly 
laid upon the fine-adjustment wheel or turned back from it, is suf- 
ficiently evident. 
Microscopy at tHe Army Mepicat Mvuseum.—The Medical 
Society of the State of New York, one of the largest and most 
influential organizations of the kind in this country, at a recent 
meeting adopted a series of resolutions expressing its interest in 
and appreciation of the microscopical work of the United States 
Army Medical Museum at Washington. The Society approves, 
with some degree of enthusiasm, the methods of investigation, 
and of disseminating results, employed at the Museum, especially 
in regard to the study of healthy and diseased tissues; believing 
that the progress attained is of material use to the profession, and 
that it would be unattainable at present without the unusual facil- 
ities furnished by the Government. —R. H. W. 
NOTES. 
—oo——— 
Mr. Boucard, the well known dealer in specimens of N atural , 
History, and traveller, formerly living in Paris, but now resident 
in London, proposes the publication of a work on the Coleoptera 
of Mexico and Central America, including the adjacent portions of 
the United States, especially the Pacific region. He earnestly 
desires contributions of specimens, whether named or not, to be 
used in his investigations, and will return such as he is not per- 
mitted to keep, suitably identified, and will render an equivalent in 
other specimens, if desired, for such as are sent to him to 
retained. Any specimens intended for him may be sent through 
the Smithsonian Institution, or direct to his establishment in Lon- 
don, 55 Great Russell street, Bloomsbury, W. G. _ 
