33 BACTERIA. 



This block is divided into two wings, each about twenty- 

 five metres long and fifteen metres from back to front ; in 

 the right wing, on the ground floor, are the rooms set apart 

 for the examination of patients who have been bitten by 

 mad dogs, and for their treatment by the preventive 

 inoculation method. The patients who enter the grounds 

 at the right are directed by an intelligent porter through 

 a door at the right of the building to a waiting-room 

 heated and well lighted, surrounded with benches on 

 which they may rest while waiting for their turn to 

 come ; they then pass into a room where their names, 

 addresses, and particulars of their cases are carefully 

 recorded. After being duly registered, they are passed on 

 to the inoculation apartment, where they are treated in the 

 manner already described. Should any patients show 

 symptoms of faintness, they are assisted into a small room 

 in which is a sofa, on which they may recline ; the others pass 

 out into a central passage, on the opposite side of which 

 is a room where severe bites and lacerations are attended to 

 surgically. Here also are an operation room, archive room, 

 and others. Next to the room in which we left the faint 

 patients, is the laboratory in which the preparation of the 

 cords that are used for the manufacture of the virus is 

 carried on. It is maintained at a constant temperature 

 of 23 C. by means of a special regulator. Around 

 this is a regular array of bottles, arranged on shelves fixed 

 to the wall, and grouped according to the time that they 

 have been exposed to the dry air. A screen within the 

 door prevents draughts, and helps to maintain a constant 

 temperature, even when the door is frequently opened. 



In the left wing, on the ground floor, is a lecture-room for 

 biological chemistry, which will accommodate about fifty 

 auditors ; it is separated from a laboratory by a wide door- 

 way, which, when open, permits of those in the lecture-room 

 seeing what is going on in the laboratory. This opening may 

 be closed altogether by a large black screen, or by a ground- 

 glass plate, on which lantern projections may be thrown. M. 

 Duclaux, professor of biological chemistry in the Sorbonne, 

 now delivers his course here, and M. Roux lectures on Prac- 

 tical Micro-biology. From time to time those who are working 

 in the laboratory, or others, also give demonstrations and ex- 

 planations of their work and of any recent discoveries in this 



