233 Heport — 1877. 



Mr. E. W. Brabook made a proposal to the Committee for carrying out the 

 provisions of the vote of the Association in relation to typical photographs, 

 and fifty copies have been printed in pamphlet form for the use of the Com- 

 mittee. 



A series of photographs of natives taken at tho Straits Settlements have 

 been submitted by Mr. Francis Galton. 



The results of the communications received and the measurements which 

 have been taken have shown that more detailed instructions are necessary to 

 enable the various observers to conduct their measurements upon a uniform 

 plan, without which the returns are misleading, and the printed instructions 

 have been modified accordingly. 



With a view further to ensure uniformity in returning the colour of the 

 hair and defining the terms to be employed in the descriptions, ton litho- 

 graphed patterns of hair-colours corresponding to some of those used in M. 

 Broca's tables have been printed, and three hundred copies havo been bound 

 up for distribution to the collectors of the statistics. 



Coxeter's spirometer having been found too small to record tho breathing 

 capacity of large men, measures have been taken to ensure tho improvement 

 of the instrument. An additional set of instruments for measuring height, 

 weight, and strength of arm have been obtained from Messrs. Tisley and 

 Spiller, opticians. 



It being the opinion of the Committee, as the result of their examination 

 of the measurements already received, that the necessary uniformity is not 

 likely to be obtained without trained observers, measures havo been taken to 

 secure the services of a non-commissioned officer of the army, by whom it is 

 proposed to promulgate a uniform system of measurement in different localities. 

 The arrangements for carrying out this experiment are still in progress. 



Although the Committee has not yet obtained sufficient data to enable 

 generalization to be formed, it is thought that the necessary preliminaries have 

 been taken to secure accuracy, and that the measurements taken under the 

 new instructions may be relied upon. 



Report on the Conditions under which Liquid Carbonic Acid exists in 

 Rocks and Minerals, by a Committee consisting of Walter Noel 

 Hartley, F.R.S.E.,E. J. Mills,D.Sc.,F.R.S.,«^W. Chandler 

 Roberts, F.R.S. Brawn up by W. N. Hartley, F.R.S.E. 



In a paper read before the Chemical Section of the British Association at the 

 Glasgow Meeting, I described the method of determining the exact tempera- 

 ture at which the carbonic acid which is sometimes found enclosed in the 

 cavities of rocks and minerals becomes gaseous. This temperature is called 

 by Prof. Andrews the critical point, and has been determined by him, in the 

 case of carbonic acid in as pure a state as it could be procured artificially, to 

 bo 30°-92 C. 



The following Table shows the critical point of the carbonic acid enclosed 

 in various minerals, and certain variations are apparent which may be 

 accounted for, when the critical point is below the normal temperature, by 

 the carbonic acid being mixed with some incondensible gas like nitrogen. 



