(IX) 
MINUTES OF PROCEEDINGS 
OF THE 
ROYAL SOCIETY OF SOUTH AFRICA. 
Ordinaky Monthly Meeting. 
June 15. 1910. 
The President, S. S. Hough, Esq., P.R.S., in the Chair. 
A letter from His Excellency the Administrator was read announcing 
that he had received a telegram from the Eight Honourable the Secretary 
of State for the Colonies, conveying the thanks of their Majesties the King 
and Queen, Queen Alexandra, and the Eoyal Family, to the Eoyal Society 
of South Africa for their kind message of sympathy. 
Dr. A. Theiler communicated a note on Anaplasma marginale, a new 
Genus and Species of the Protozoa. This Anaplasma is transmitted by 
ticks, and it is a noteworthy fact that the incubation time by tick trans- 
mission is much longer than that after inoculation of the animal with 
blood ; in the experiments carried out it varied from 55 to 75 days. 
Blood of an immune animal is infective ; such an animal forms the 
reservoir of the virus. This is a peculiarity of the piroplasma diseases to 
which group Anaplasmasis also belongs. Dr. Theiler's opinion is that 
Anaplasmasis is probably the disease which the farmer has hitherto called 
" Gall Sickness." Up to the present four different parasites are, in South 
Africa, found in the blood of immune cattle, and they can all be transmitted 
by the inoculation of the blood and by ticks. 
" On the Development of Piroplasma parvum (Protozoa) in the Various 
Organs of Cattle " by Dr. E. Gonder. The author suggests an explana- 
tion of the fact that the blood of animals suffering from East Coast fever 
injected into healthy animals does not transmit the disease. It is possible 
he thinks, that the blood contains forms which can develop in the tick, 
