The following persons will be members of the Congress: 
The official delegates of the countries represented. 
The representatives of the universities, institutes, societies, and 
scientific bodies of the countries represented. 
Such persons in the countries participating in the Congress as may be invited 
by the Executive Committee, with the approval of the countries represented. 
All writers of papers, 
A 1 members of the Congress shall be entitled to attend its sessions, 
to take part in the debates and to receive a copy of such publications as the 
executive Committee may issue. There will be no membership fee of any character, 
A GENERAL STATEMENT FOR ALL SECTIONS. 
Rules of the Congress: 
III. In view of the great number of papers to be submitted, they should 
be as concise as possible. It is desirable that each paper shall 
be . typewritten. They may be accompanied by illustrations and 
tabular matter to clarify and shorten descriptions. 
T V, It is suggested that illustrations be limited in number, and be 
submitted upon sheets not over 10 inches by 22 inches (25 cm. by 
56 cm.) including the border, or 9 inches by 21 inches (23 cm. 
by 53 cm.) inside the border. 
V. Each paper should be accompanied by a 'resume of not more than 1,500 
words, followed by a footnote giving the bibliography of the sub- 
ject to include references to important original papers and sources 
of information referred to in the paper. Article V may not apply to 
all sections. Writers of papers will govern themselves accordingly. 
Papers should not exceed 30 minutes in length. Technical matter 
should be made particularly plain. Definite arrangements for the use of illus- 
trative matter and lantern slides in the reading of a paper should be trade as 
early as possible. Lanterns will be provided by the Congress. Authors are to 
iUrnish other material for this purpose. In addition f o the above-mentioned 
resume, authors are respectfully requested to furnish an abstract of their 
papers not tc exceed 500 words, preferably 300 words. This abstracx should be 
furnished in the language of the paper and should be sent to the Secretary 
General as soon as possible, although it may accompany the paper. 
