CHEMICAL LABOKATORY AT THE UNIVERSITY OF SYDNEY. 175 



and the I'epairs are apt to be left for a more convenient season, 

 and too often are not ready when wanted, Also tlie storage 

 cylinders for compressed hydrogen, oxygen, coal gas, and sul- 

 phuretted hydrogen and an extra deep sink. 



Ample space is provided for washing and drying apparatus for 

 distillations and similar operations. 



COLLECTION ROOM AND MUSEUM. 



The finer ajDparatus and collections of rarer chemicals are to be 

 kept in the collection-room opening out of the lecture preparation 

 room. And in this will be placed the diagram table and cabinet. 



To avoid interfering, as far as possible, with the museum or 

 students' collections it is proposed to have one case set apart for 

 the specimens and special appliances required for each lecture, 

 arranged in trays, ready to place out on the lecture table. The 

 collections of carbon compounds will be arranged so as to show 

 their derivation from the hydro-carbons and their relationship to 

 one another. 



CLASS ROOM. 



This is a smaller lecture room to seat one hundred and thirty 

 students for special courses of lectures and tutorial classes, it is 

 arranged and fitted in a somewhat similar way to the large or 

 principal lecture-room. 



DEMONSTRATION ROOM FOR JUNIORS. 



This I'oom is thirty-six by thirty -four feet, and contains forty 

 benches, each three feet nine inches by two feet (Plate IX.), 

 arranged so that the whole face the demonstration table. Each 

 bench is amply supplied with gas and water, and with an aspirator. 

 The sulphuretted hydrogen supply is laid on to the large window 

 draught cupboards, as well as to the benches; any escape of gas 

 into the room will be prevented as far as posiible by connecting 

 the exit tube with the aspirator or draught hood on each bench. 



The drauglit cupboards in this room have already been described. 

 When full, this class-room will probably want two demonstrators, 

 one to illustrate and describe the experiments, and the second to 

 assist those students ^\'ho have not kept pace with the lecturer's 

 experiments. 



BALANCE ROOMS, AND LIBRARIES. 



To ensure stability, and to avoid vibration from the floors, the 

 balances are to be placed on slate slabs let into the walls. In 

 each balance-room one or more glass cases are provided for books 

 and apparatus ; the smaller and more delicate pieces being kept in 

 cases arranged on the walls over the balances. There are also 

 reading and writing tables provided, since these rooms will alsa 

 have to serve as libraries for the various departments. 



