228 



NATURE 



[July 9, 1903 



The Incubation Room is a small insulated room, the in- 

 sulation being obtained by its having double walls, the 

 space between which is packed with asbestos. It has two 

 doors forming a small " air-lock " to prevent the inrush of 

 cold air on opening the door. By means of a gas stove 

 and Roux regulator the temperature is maintained at body- 

 heat. This room is used for the cultivation of the different 

 microorganisms used in connection with the work of the 

 establishment. 



The Bottling Room is reserved entirely for filling the 



JENNER INSTITUTE OF PREVENTIVE MEDICINE 

 ALDENHAM HERTS. 



LARGE 

 GROUND 



LABORATORY 

 FLOOR PLAN 



SCALE OF FEtT 



serum into flasks. The windows are of non-actinic ruby 

 glass, and are air-tight. Before bottling is commenced the 

 room is filled with formalin vapour, which is allowed to 

 remain in the closed room all night. In the morning the 

 formalin vapour is displaced by a current of cold air from 

 the outside of the building, which is blown into the room 

 by 'the Root's blower in the engine room. This air is 

 sterilised before its entry by passage through a large filter 

 of sterile cotton wool. The current of sterile air is main- 

 tained throughout the process of bottling, entering the 

 room through the filter and passing out by an exit in the 

 roof through a cotton-wool filter. 



The Culture Medium and Sterilising Room. — This room 

 is used for the preparation and sterilising of the media 



NO. 175^, VOL. 68] 



employed in the cultivation of the various microorganisms. 

 It is fitted with autoclaves, steam sterilisers, thermostats, 

 &c. This room communicates with the cultivation room 

 by double doors, through which the flasks can be passed 

 after inoculation, thus avoiding lowering the temperature 

 of the hot room by repeatedly entering it. 



The Glass Cleaning Room contains a dry-heat disinfector 



for sterilising the glass apparatus, and is fitted specially 



for the purpose of cleaning and sterilising glass apparatus. 



An Isolated Laboratory stands entirely apart from any 



other building. It 

 is used for the 

 preparation, filtra- 

 tion, and precipita- 

 tion of such things 

 as tetanus toxin, 

 &c., and for the 

 examination of 

 small animals. 



At a considerable 

 distance from the 

 main laboratories, 

 there is a complete 

 small department 

 with stables for 

 carrying on work 

 in connection with 

 other infectious dis- 

 eases, in addition to 

 those previously 



mentioned. 



The A nimal 

 Houses are ordinary 

 garden greenhouses 

 which have been 

 adapted and prove 

 excellent for the 

 purpose, as they are 

 easily kept to an 

 even temperature. 

 The largest is used 

 as an experimental 

 animal house for the 

 housing of animals 

 employed in the 

 testing of the sera, 

 toxins, &c. The 

 roof is covered with 

 vines, which have 

 been retained as 

 affording a shelter 

 from the sun in 

 summer. The two 

 smaller houses are 

 used for breeding 

 purposes. The three 

 houses are heated 

 by a system of hot 

 water pipes. 



The Principal 

 Stables form two 

 blocks of buildings 

 about 200 yards 

 from the labora- 

 tories. They are all 

 brick, and of the 

 most modern type. 

 There are two 

 yards, the first of which is covered by a high glass roof, 

 and opening from this yard is the operating room, where 

 the horses are injected and bled. The stabling consists 

 entirely of loose boxes, which are very well ventilated, and 

 are all of a large size, so that the animals have ample room 

 to move about freely. 



In the vicinity of the operating room is a small isolated 

 room with slate benches, where the blood flasks are allowed 

 to stand, and where the serum is decanted. 



In one of the meadows, at a distance from the stables, is 

 a loose box which is used as an isolation box. All new horses 

 here undergo a period of quarantine. There are several 

 other loose boxes in the various meadows, as well as an 

 isolated cow-shed, goat-house, pigeOn-house, rabbit-runs, &-c. 



PAUL WATERHOUSE 

 ARCHITECT 



of the Jenner Institute at Elstree, Herts. 



