710 General Notes. [July, 
Pb, Cl (AsO, + Pb, Cl (VO,); or about equal proportions 
of vanadinite and mimetite. He, has assigned to them the name 
Endlichite in honor of Dr. F. M. Endlich, superintendent of the 
Sierra mines at Lake valley, N. M. The same paper contains 
new analyses of vanadinite and a crystallographic investigation, 
by Professor G. vom Rath, of the New Mexican decloizite, illus- 
trated by four figures. These crystals, which are the best ones 
thus far known, indicate that the mineral is orthorhombic, as was 
surmised by Des Cloizeaux instead of monoclinic as held by 
ebsky. Associated with the vanadinite of Sierra Grande fine 
crystals of iodyrite were also found. 
BOTANY.! 
American MEDICINAL PLAnts.—We recently noticed the first 
fascicle of this work, by Dr. Millspaugh, as worthy of patronage. 
in examination of the second fascicle confirms our favorable 
opinion. The illustrations are very good, and will not only serve 
admirably their purpose of enabling the medical student to recog- 
nize the various species of medicinal plants, but they will be 
found of value to the teacher or student of ordinary botany. In 
the second fascicle there are colored plates of Actea spicata, 
Carya alba, Cephalanthus occidentalis, Cypripedium pubescens, 
Equisetum hyemale, Fuglans cinerea, Mitchella repens, Thuja occi- ` 
dentalis, Viola tricolor, etc., etc., thirty in all. 
DEVELOPMENT OF STOMATA OF THE OAT.—Before the stomata 
appear the epidermis is composed of quadrangular cells, which 
afterwards grow much faster in length than in breadth. The 
mother-cell of a stoma is cut off from the end of one of these 
cells, and sometimes each cell in a row furnishes a stoma (Fig. | 
1a). This mother-cell rapidly increases in size, and large masses 
of protoplasm touching the cell soon become evident in the cells 
adjacent to the sides (Fig. 1 4 6). This gathering of protoplasm 
IS preparatory to the formation of accessory cells, which are a 
first nearly semicircular, and are cut out of the adjacent cells, one 
on each side of the mother-cell (Fig. 244). The central and 
accessory cells now enlarge in about the same proportion until 
the former divides into two guard cells (Fig. 4); after this the 
accessory cells encroach upon the guard cells until in the mature 
stoma the latter are narrower through the center than at the 
ends ; and the width of the whole four cells is but little more 
than of one single epidermal cell (Fig. 6). 
The behavior of the protoplasm is very characteristic, the gen- 
_ eral rule is as follows: The mother-cell and the accessory cells 
are both at first full of rich protoplasm. In the accessory cells 
this tends to condense in the center; vacuoles first appear in the 
= ends of the cells (Fig. 3), these increase in size with the develop- 
a : __ * Edited by ProrEssor CHARLES E. Bussey, Lincoln, Nebraska, 
oe ON ee ae RS ae Se ee 
