262 Tue Microscope. 
oa TNE 
Atems, 
Mr. R. N. Reynolds, of Detroit, has published some “ Notes 
on Microscopic Work,” consisting of sixteen pages, with the 
suggestive title, ‘A Rat followed from the Corn-crib to the 
Microscopist’s Cabinet.” 
CELLULOSE ACCOMPANYING THE FORMATION oF ORYSTALS.—A. 
Poli has noted in the pith of a number of plants belonging to 
the order Melvacew, clusters of crystals attached to the cell- 
wall by strings of cellulose. He has examined the structure of 
these strings, and finds them to be hollow tubes. They gener- 
ally exhibit swellings here and there, and bright refringent 
spots, which are probably the points of origin of new crystals. 
Their composition is the same as that of the cell-wall, and they 
not unfrequently become liquified in the same way. They ap- 
pear to occur in all the arborescent species of the order, most 
beautifully in Walvaviscus mollis. 
THE TuBERCLE Bacriu1.—So far as Koch’s work upon tuber- 
culosis is concerned, it remains a complete monument of scien- 
tific accuracy, and has suffered nothing in the time since it was 
erected. The strength of his arguments has not been in the 
least weakened, the accuracy of his experiments stands unas- 
sailed, and the justness of his conclusions is thus far incontro- 
vertible. As matters stand to-day, we are bound fo consider 
that the cause of tuberculosis is found, and that that cause is, 
or is contained in, the bacillus of Koch, to whom all honor is 
due for the beauty and completeness of his investigations upon 
this important subject. 
APPARATUS IN Leaves FoR Rerriectine Ligut.—O. Penzig 
has examined the structure of the clusters of crystals found in 
the leaves of the Aurantiacew, clothed with cellulose, and at- 
tached to the wall of the mother-cells, the idioblasts of Pfitzer ; 
and believes they are connected with the dispersion of the rays 
of light in the dense palisade-tissue. They always have their 
principal axis vertical to the surface of the leaf, and are fixed 
in this position by a peculiar band of cellulose. The rays of 
