447 
Experimental Studies in Indian Cottons.* 
By H. Martin Leake, M.A., Economic Botanist to the Government of the 
United Provinces of Agra and Oudh, India. 
(Communicated by W. Bateson, F.R.S. Received January 9,—Read 
_ March 2, 1911,) 
In the course of these experiments, most of the types of cotton cultivated 
in India have been grown, but the experiments are confined, with few 
exceptions, to those types common to Northern India. These types fall into 
two groups, which are characterised by the form of the secondary branches. 
These may be either monopodial or sympodial,t and in pure types they are 
either monopodial, with a few apical branches sympodial, or sympodial, with 
a few basal branches monopodial. Types in which the secondary branches 
are all monopodial or all sympodial do not appear to occur, though indi- 
viduals may be so characterised. The types which have given the material 
for these experiments have been grown in pure culture for a series of years, 
and may be grouped as follows :—t 
Monopodial Types.§ 
(a) Foliage green— 
Plant glabrous or nearly so, branches ascending, bracteoles triangular 
with margin entire or dentate, leaf factor <2. Type 1, G@. obtusi- 
folium, Roxb. 
Plant pubescent, branches spreading, bracteoles deeply auriculate or 
reniform with margin deeply serrate, leaf factor < 2. Type 2, 
G. herbaceuwm, Linn. 
(b) Foliage red— 
Plant differing from Type 1 in colour of foliage and petals, and in 
leaf factor, which is > 3. Type 3, G. arborewm, Linn. 
* Conducted at Cawnpore by the Botanical Research Section of the U. P. Department 
of Agriculture. 
+ Balls, ‘Journ. Ag. Soc.,’ vol. 2, p. 336 ; Cook, U.S. Dept. of Ag., Bureau of Plant 
Industry, Bull. 88. 
t Cf. the classifications of Todaro, ‘ Rel. sul. Cult. dei Cotoni,’ 1877 ; Watt, ‘The Wild 
and Cultivated Cotton Plants of the World’; Gammie, ‘The Indian Cottons.’ In all these 
the habit of the plant is not considered. 
§ Only sufficient description is here given to serve the purposes of the present note. 
De Se 
