12 



micro-pliotographic 'apparatus and appliances for ultra microscope work. 

 The illumination for these is provided by a thirty ampere arc lamp, or 

 by means of a hehostat placed on a brick pedestal outside the window. 

 Heavy curtains are hung at the windows so that the room can be com- 

 pletely darkened when required. A well fitted up dark room adjoins and 

 opens out of this room. 



The three next rooms, all facing west, are used for the preparation 

 of rabies vaccine, according to the Pasteur method. The centre room 

 is a small laboratory. An inner room opens out from it which is fitted 

 with double doors and windows, and here the temperature is regulated 

 by a similar stove to the one in the incubation room. This room is 

 exclusively used for drying the Rabies cords. On the other side of the 

 laboratory is a room for keeping the small animals and fitted similarly 

 to the small animal room on the eastern side of the building. 



In the back wing the rooms devoted to the preparation of horse- 

 sickness serum and blue-tongue vaccine are situated, and the last two 

 rooms to the nortli are the operating theatre and the post-mortem room. 

 Passing from the main corridor through the glass panelled door mentioned 

 before, on right and left are doors opening out on the verandah facing 

 the quadrangle yard, and on to a verandah running north and south on the 

 west side of the back wing ; in front is a corridor with a door at the end 

 opening into the operating theatre. There are two rooms on the right — 

 first, a small laboratory used for testing the serum for its haemohtic effect 

 and sterility ; second, the serum preparation room, a large room with two 

 windows facing east and a hatch opening into the operating theatre, so 

 that the bottles filled after tapping can be expeditiously passed through 

 from the latter. In this room the preparation of horse-sickness serum 

 for the immunisation of mules is carried on. The laboratory annually 

 sends out more than 1,000 litres of this serum to all parts of South Africa. 

 Blue-tongue vaccine is also prepared here, and of this in the past year 

 nearly 200,000 doses were issued. 



Facing this room on the left of the corridor is a sterilizing room which 

 is also provided with a hatch opening into the operating theatre, to 

 facihtate the easy passing through of sterihzed bottles ; and there is a 

 second hatch opening into the post-mortem room, which adjoins the 

 operating theatre. Next to the steriUzing room, and connected with it 

 by a door, is a small room fitted with shelves for sterilized bottles, and 

 opposite the Serum Laboratory is the tick and insect room, where ticks 

 used in connection with the experiments in the transmission of the various 

 protozoa and diseases of the country are bred and kept during their 

 moulting stages. 



To the left of the door opening on to the west verandah is a door leading 

 into the serum storeroom, where the serum, blue-tongue vaccine, and 

 other preparations, after having been bottled, sealed, and labelled are 



