88 
Mr. Brown’s Observations on the 
in the passage referred to observed that the valvular and indupli¬ 
cate modes of restivation easily pass into eaeli other, merely by 
an addition or abstraction of the elevated margins of the laciniee : 
instances of their abstraction, and of the consequent conversion 
of the induplicate into the valvular mode, occur in several Good- 
enoviae, and in some Convolvulaceae and Solanaceae ; while 
Chuqiiiraga and Corymbium are examples of their addition in an 
order where they are generally wanting. 
My third remark is entirely borrowed from Schkuhr*, who 
states that in all Cichoracece or Ligulatee the pollen is angular, 
and that in Corymbifcrce and Carduacece , or in all tubular florets, 
it is spherical or oval. 
All the figures which this author has given of pollen in Cicho- 
raceac represent it as a regular icosahedron, except that of Gero- 
pogon glabrum , which is a dodecahedron. I believe neither of 
these forms of pollen has been observed in any other family of 
plants. 
A fourth remark on Composite I do not offer with absolute 
confidence, as it is opposed to the statement of M. Cassini, on 
whose general accuracy I have great reliance. It relates to the 
disposition of the branches of the style or stigmata, which accord¬ 
ing to M. Cassini are lateral, or right and left with relation to the 
axis of the common receptacle; whereas, 1 consider them as an¬ 
terior and posterior, though in many cases by a slight degree of 
twisting in the style they acquire what M. Cassini regards as 
their original position. 
This may seem a point of very little consequence to establish. 
Independent however of the necessity of minute accuracy in 
every case, it appears to me to have some connexion with my 
fifth remark, which relates to the internal structure of the Ova- 
* Botanisches Handbuch 3. p. 8. 
riu m 
