Friitex nanus, ramosus, cortiee 
culata, 1-.") mm. longa, <>•;>_ 1 mm. lat 
Cctpilulu terminal ia, solitaria. 1 1- 
flora. 
iquamae subquinqueseriatae, interiore 
■ jmigae. -J ■.'■;» mm. latae, Hneari-oblongae, obtusae, 
itiin minores, apice dorso gibboso-dentatae. viride< mem- 
oeo -marginatae, subnnidae. CrnW, S mm. longa, tubulosa, 
contraetn. apme .,-dentata. ,,,.,,„,, : ( , ontt . > ., mm< , ongaf / 
vl sti'n'un "" 'y^'/ 1 "/ n,r ' r " { '" I " llr ". 1,,,l - !s ;,lbis appressis 
XIX.-PERSIAN GUM. 
the 
details gathered fvom ;h,. />/,,,, ',,,,,, -ml ;,- l( l T,.,tr„'ii Abo- •},'^t','^ 
1.S9H, p. 79:5. may be ,,„oted, nut onh a- throwim- li'du uiln •[«■■ 
subject, bin also as an illustration" of tin- dillieuin fiv!, uen'i 1 v 
experienced in d< t« rmining lu _ _ri j I , , ,s ell as |„ botu ,,- 
1 a] sources of a trade product. n ry IVoiv^or 
E. S,ckenberger, tJie writer of the note referred to sav-> that it 
quantities of this gum "are sent from Bushire. either 
" to a small port on the west coast of the Red Sea or to .b-dda. in 
- -I'drr that u may be substituted for Kordofan -urn. It is thence 
'" conveyed to Assouan and packed in old Kordofan packages and 
" sold as genuine gum. Owing to its pale colour and the absence 
■*" t ll »y*"- :r-,m Assouan eould he other than 
Arab;, . a considerable amount has been sold. The gum, 
-however, is described as not soluble in water, but only swelling 
" up m it. and as being less brittle than Kordofan mini. 'Professor 
- Mckenber-cr suggests that this Persian -urn mav be the „r«>duee 
"'p 1u l"';;;;;, ' t • u -> 1 '-^^ r, ,,„,,, pum,,,,,. hw.. 
" »" ather th;i11 the white minutely '^^'nl^i'pni'lxmP 
With regard to the suggestion that this gum mav possibly be 
derived from P. Ij,,l;h<i rimsi* and P. PwhJ,i„ K it mav he well to 
state here that the Herbarium contains no specimens of the first 
mention. I species. ,i.d as fur as can be ascertained there is no 
li" 1 ;' 1 ';^ ' ] deseript on of it. In Hooker's Flu, / ■■; lh it IP;, /„.„.,. 
\ ol. II.. p. 315, it is placed under P. communis, Huds., var. 
inntitm. with the following note :— " I have seen no specimens 
rirnsia, but have no reason to 
