614 PROCEEDINGS OF SECTION H. 
dwelling and assembling for various purposes under one 
roof, in one building, or group of buildings, let us con-. 
sider for a moment some of the requirements of a modern 
city, or modern great building (which is a city in minia- 
_ ture), and see how the lives, health, comfort, and even the 
morality of a community are in our hands. 
We may group these requirements under the following 
heads : — 
1. Capacity —The adequacy of the accommodation for 
the purposes to be served. ; 
2. Cost.—Economy of materials and labour— 
A.—In construction ; 
B.—In management and maintenance. 
3. Agcess.— 
A.—From without: by road, rail, tram, water, 
&e. ; 
B.—From within: by stairs, elevators, &c. 
4. Communication.— 
A.—From without: postal, telegraph, tele- 
phone, despatch tube, speaking tube, 
bell, semaphore, «ce. ; 
B.—From within: ditto. 
5. Health.—Sanitation in all its branches; lighting, 
heating, ventilation, water-supply, drainage, &c. 
6.—Comfort.—Suitability of purpose, and provision in 
detail for fulfilling all the demands which will 
be made upon it with a minimum of strain or 
inconvenience. 
7. Safety.— 
A.—Safety in construction: stability ; 
B.—Safety in working: provisions against fire, 
panic, &c., and for efficiency of manage- 
ment, 
8. Beauty.—Both externally and internally— 
* A.—Of form ; 
B.—Of color ; 
C.—Of material, as far as is consistent with cost. 
1. Capacity.—The quite recent developments of science 
and the extension of the uses of iron and steel have enabled 
the demands upon capacity to be met on a greater scale 
than formerly. Spaces may be, and are, now roofed over 
in one span which could not have been so treated in any 
former age. The gregarious instincts of mankind can 
therefore be indulged in to a greater extent than ever 
before, and provision has to be made for the assembling 
