Séance du i 3 Juin 1917 
Norman Walker in his Introduction to Uermatology p u b 1 i s lied 
in 1916 lias given a most intëresting and vvell illustrated account 
of the conditions observed by himself. 
Wilh regard to Dermatitis Venenata as seen in the Tropics, 
Régnault in 1902 contributed a brief reference to the éruptions 
seen in Indo-China ; in 1911 Letgher gave a good account of the 
Buffalo Beau of Rhodesia and in 1914 Hornsey did the saine 
with regard to the Rungusof Brilish North Bornéo. In the saine 
year Cleland wrote an admirable summary of the plants posses- 
sing acrid juices, producing vésiculation and dermatitis in Aus- 
tralia. In 1915 Vadala drew attention to the rash found in per¬ 
so ns working with Arundo donax. 
In 1913 Castellani and Chalmers attempted a brief summary of 
the subject as known to lhem because,in their opinion, it requi- 
» red further study in the Tropics. 
With these preliminary remarks we wilf pass on to consider 
our présent case. 
Sudan Case. — A European résident in the Sudan noticed that 
after he had examined some herbage at a certain place on the 
Nile he was attacked by an erythematous swellingon the hands 
and at the saine time small reddish spots appeared on the chest. 
On this first occasion he w ore long boots and his stay in the 
région in question being only two days the éruption disappea- 
red completely in about 3-4 days after departure there from and 
he could assign no cause for this skin affection. 
On the i(î th. of March of this year he proceeded to Ganetti 
in Dongola Province in order to attempt to control an outbreak 
of locusts by means of the Goccobacillus and for this purpose he 
was compelled to work among.a rue called Haplophyllum tuber- 
culatiim (Forskal 1776 ) (Fig. 1 ) which was growing abundantly 
in this area and was in flower. 
As he was searching for the young locusts, commonly called 
hoppers, he was compelled to bend down among the rue and to 
separate plant from plant with his hands; at this lime he was 
wearing only low shoes and not boots. 
He arrived at the place at 4 P* m * on the i 6 lh. of March and 
began work seriously 011 the morning of the 171 ) 1 . of March. 
Durino- the afternoon of the 181 h., that is to sav about 3o hours 
after he began working in the rue, he was troubled with marked 
