3. That the period of incubation is about lb days..

4. That the ultra-visible virus can and does cause a febrile condition without the formation of lesions in the pleura and lungs (see goats 5, 12 and 17). Observations on natural outbreaks of the disease in the field supports this theory.

5. That the lesions in goat 13 were due to the secondary invader, as the period between the inoculation of the infective material and the appearance of the symptoms was too short to be caused by the ultra-visible virus. This suggestion is supported by the results obtained with goat 17. In this case filtered suspension of infected lung scraping was injected and produced no lesions, although later i.e. after 16 days, there was a temperature reaction.

PERSONNEL.

1 wish to again bring forward the question of a trained laboratory assistant, and request that one be appointed.-Major Jarvis and I gave our reasons in the report on the pan-African Veterinary Congress, for thinking that a trained assistant was necessary.

One has only to compare the Staff of this laboratory with that of any other. Veterinary laboratory in the world, and also with the Staffs of the Wellcome Tropical Research Laboratories, not omitting to take into consideration the scope of the work and the economic aspect of the case, to see that it is advisable to employ a trained laboratory assistant.

Mohamed El Hassan, the native laboratory assistant, has carried out his duties in a very earnest manner.

EQUIPMENT.

This has been kept up to date, a new electric centrifuge having arrived recently from England.

SPECIMENS.

Two hundred and three slides of interesting specimens have been made and sent to the Royal Army Veterinary School, at Aldershot for class demonstration purposes. The slides used have been replaced by the Royal Army Veterinary School.