WEEDS AT THE WORLD’S COLUMBIAN 
N. J. Experiment Station, 
New Brunswick, N. )., 
March 4, 1892. 
Dear Sir: In order that the exhibition of weeds at the World’s Columbian Expo¬ 
sition may be large, and representative of all sections of the country, the undersigned (hav¬ 
ing this feature in charge) respectfully asks for specimens of the worst weeds from all States 
and Territories. 
It is suggested that each botanist or local collector, who may be pleased to assist in 
the work, secure at least three specimens each of the worst weeds in his State or section. 
In making the specimens it is important that the following points be considered: [1.] 
Seeds are especially desired. [2.] Seedlings are important in various stages of develop¬ 
ment. [3.] The root system is essential; also [4] the flower and flower cluster, and [s] 
the seed vessel. 
It may be necessary, therefore, to secure these various essentials at different times dur¬ 
ing the coming season. If the weed is a large one stress is laid upon the procuring of spec¬ 
imens while they are small enough so that the whole plant, roots and all, can be mounted, 
without bending, upon an herbarian sheet of ordinary size, that is, not over a foot in length. 
They are not to be mounted, however, by the collector. 
That unnecessary duplication may be avoided persons who contemplate collecting 
specimens should signify their intention to the undersigned, and allotments will then be 
made, the assignments depending largely upon the locality. It is hoped that each State in 
the Union may be represented by specimens in this national exhibit of our worst weeds. 
The collecting must all be done during the present season, and the specimens sent in 
for mounting, labeling, etc., b} 7 December 1st. 
Correspondence is solicited. 
BYRON D. HALSTED. 
