178 | General Notes. [ Feb, 
skopische Physiographie” is contemplated by Mr. J. P. Iddings, 
of Washington. It is proposed to omit those parts which are 
not essential to the production of a good text-book, and to in- 
corporate the remaining portions in one volume. As the labor 
involved in translating the work is very great, it. may be some 
time before the English version is given to the public. 
BOTANY.: 
A Study of the Growing Parts of the Stem of Pinus 
strobus. THE WHITE Pine.’ —Before beginning work on this 
| special part of the subject a cursory examination was made o 
the tissues in general as compared with that of Pinus sylvestris, 
the so-called Scotch Pine. Roughly speaking, they are the 
same,—a central pith, a zone of xylem varying in width according 
to the number of years’ growth, the phlceum, outer cortex, and 
the epidermal system. But by direct comparison the tissue of 
the White Pine is seen to be more dense than that of its foreign 
relative,—the cells having a smaller ARRE and the resin pas- 
sages being smaller and less numerou 
In Pinus sylvestris there are ket rows of resin passages in 
each year’s growth of the xylem, one comparatively near each 
margin of the zone, while in Pinus strobus there is but one row, 
which lies towards the outer part of the zone. Sometimes an 
extra passage is found lying deeper in the xylem. On the con- 
trary, in the outer cortical tissue of Pinus strobus are two rows 
of resin passages, the inner row being much larger than the 
outer one, but both being quite large, while there is but one row 
found here in Pinus sylvestris 
Growing from the epidermis of the bud and young shoot of 
Pinus strobus are many glandular, often capitate, hairs, composed 
of but two or three somewhat elongated cells, filled with densely 
granular matter. ese, appear to be secretory hairs, producing 3 
the resin that is found in such abundance in the bud of the : 
ia Pine. They were not found in the Scotch Pine. 2 
In the phloeum, in slehgated cells which are distributed irregu- 
larly throughout this tissue, with the exception that they never 
* occur within a zone of about eight cells from the xylem, occur 
large numbers of crystals of i mes of lime. Fig. 1 of, plate i is 
- 
the ariii of a Geyer stem, showing parts of five of these 
cells, three of which contain crystals. These crystals do not lie 
oe the cell-wall, but are embedded in a substance which more or 
ron ene. fills the~cell, offers great resistance to acids, is 
Edited by Prof. CHARLES E. BEssEY, tees, N 
ebraska. 
oe tected fe work of students in the botanical laboratory - 
a oe Universi of eee: meee and communicated by Professor V. M. 
we re 
TES 
