300 
generally. Having examined the leaf-structure of more than one 
fourth of all the Andropogoneae described in his monograph to 
see how far the anatomical characters coincide with the morpho- 
logical and can be used for the definition of the natural groups, 
he says : " The result is ahsn/utr/,, myntire. X« ither is it possible 
to distinguish anatomically the Andropogoneae from the allied 
tribes or even the remote tribe of Ghlorideae, nor is there any one 
character or combination of characters which is confined to one 
genus. Even the sub-genera possess a uniform leaf -structure only 
in some cases when they comprise less than ten species. The 
species, however, are, with the exception of such as are very poly- 
morphous, mostly well characterised by their anatomy." It must, 
however, be remarked that the leaf is probablv in. .re" plastic than 
any other organ in grasses and might therefore a priori be 
expected to exhibit the phenomena of epharmosis in a prominent 
de-ree. riie study of the anatomy of the glumes ami 
possibly yield a different result. However this may be, an in- 
ypsugation into the anatomy of the oil-grasses, and 'pan in i la rlv 
into i he development and distribution of the oil cells, is highly 
desn-able With the exception of a very valuable description of 
the oil cells of " Andropogon Schoenanthus " by Professor F. von 
Hohnel, nothing is known in this direction. Yet it is quite 
™27? i to + know the seat of the oil-yielding tissues, their 
Properties ; the time and conditions of their formation and the 
changes they subsequently undergo, must be of considerable 
importance for the rational development of the grass-oil industry, 
just as it is, from the standpoint of pure science, necessarv fur the 
complete understanding of the organisation of those grasses 
fn,w S ° faraS or f*nisation means correlation of structure and 
nrolt^rV 1 " ? 16111 ? aWait US on that »™^d, but they are 
J° p b f n ms f f ' the Physiologist. Some are of a general nature, as the 
' Tn^^t Ml e g ? ne f 1S °, f the grass-oils and the place of these in the 
ToZlfZf SX t mtS W ^ produce them ' other « ^ more directly 
TZotl Wlth ^Practical side of the subject, such as the problems 
■ , •;; n';, - '" :h r ■ V1 " 1 ' 1 "> " jl wording to the season, its reduc- 
tion of the 
SSririS^ ^ y • lces > and the apparentlv 
SSI £S£ ° n + ° f S T e f0rms ' Particularly suitable for in- 
re a Uons of n W ^ T^T ge " L "note as the 
,,,'';' j ysMdojjy to the taxonomy of the oil-grasses may 
I,, ,J " s '!' I' 1 " 1 ' 1 J '^ ' «".. h . ,1 later directly. 
;,;;,,,, ," ' ; ■ " [>im ■ ^^ > i -- *> ■«-. how &P they 
,iv,n in rhe •-:;;., ' , '- v ( ;' 1 ^ ™* wl l: „ place they ought to be 
I!!:;;;!- /:::;<! 3- ^^°^^ ^^^ 
: ' ; • : : ; . - ...■ i 
bhestruotar,,, *" >•■ —■-»■ 
actually described 
