1881.] Scientific News. 843 
larity between the two, In like manner new branches are studied 
and new comparisons made. 
“For some weeks but little use is made of microscopes or 
text-books, In nearly all important cases specimens are exam- 
ined, and a need felt for a name or a definition before these are 
given. After a few lessons answers to the following points are 
brought out: 
“Is there any definite. proportion of active to dormant buds in 
any year? Where do branches appear? Is there any agreement 
in growth as to length of branch and size of the annular ring 
each year? Is there any similarity of rapid or slow growth of 
all the limbs on a branch in each year? Is there any certain 
number of leaves ona year’s growth, or any definite proportion 
between the length of internodes? Can the smallest, old, dor- 
mant buds be made to grow? Is there any order as to what buds 
grow and what remain dormant? How much and on what years 
theses or compositions. I usually give each student one or more 
“ Pp Ss: 
The arrangement and development of parts of the flower, 
