A SEED PLANT. 85 
the explanation of the rings in the wood portion? 
Make a drawing (del. 3 in.) showing details of a 
quadrant. 
B. The Reproductive Shoots. (Cones or Strobili.) 
1. 
How do the two kinds of this year’s growth differ 
as to number, position, size, and form ? 
Study a microsporophyl] (pollen) bearing shoot which 
has been cut to show the distal half in longi-sec- 
tion and find a central axis bearing the sporo- 
phyls (stamens). With m. study a stamen to 
find a proximal stalk (filament) and sporangia 
(pollen sacs). Make proximal surface and edge 
view drawings of a stamen and name its parts, 
also a drawing of the entire shoot as prepared. 
With l.p. study some pollen and find the two thin: 
walled expansions (wings), also the one or more 
celled body. Draw and designate parts. 
Make a drawing of this year’s shoot, showing micro- 
sporophyl clusters. 
Study a yearling cone which has been cut longitudi- 
nally. On the cut surface find the central axis 
which bears sporophyls (earpels). In the axils 
(distal angles) of the carpels, find the ovules each 
of which contains a sporangium. 
On the outer surface of the cone find and explain 
the shape and arrangement of the distal ends of 
the carpels. 
Make one or more drawings to show the structure 
of the outer and the cut surfaces (del. 2 in.) and 
name the parts. 
Study a carpel of a two-year-old cone to find the 
number, position, and parts of the developed 
