Mr. Adam <m the Specific Gravities of some Crystallized Salts. 199 



completing the ordnance surveys in Great Britain and Ireland, may 

 allow of." 



It was agreed that a conversational meeting of the Society should 

 bo held on the 21st of February. 



The 6th Part of the Proceedings of the Chemical Society was re- 

 ceived on the part of that society. Thanks were voted, and for the 

 1st vol. of the Proceedings of the same society, previously presented. 



Mr. Liddell exhibited and described the Vesta lamp for burning 

 camphino ; also, a new hydrostatic lamp, for burning oil. The liquid 

 termed camphine possesses the odour of oil of turpentine. Its specific 

 gravity is '864. It begins to throw up bubbles of vapour at 160°, 

 and continues to boil up to 314°, when its point of ebullition remains 

 stationary. It has, therefore, all the characters of oil of turpentine. 



The following communication was made : — 



XL V. — Table of the Specific Gravities of some Crystallized Salts. 

 By Mr. John Adam. 



In the following table the specific gravities were determined by 

 weighing tho finely crystallized salts, first in air and then in pyroxylic 

 spirit, of the sp gr. '824, alcohol of the sp. gr. -8393, and turpentine 

 sp. gr. -870. The spirit produced no acid reaction on litmus paper. 



The first column represents the specific gravities referred to pyroxylic 

 spirit. The second, the same gravities reduced to water as the stand- 

 ard ; the third column exhibits the specific gravities in alcohol ; and 

 the fourth the same densities referred to water. The two last columns 

 were made by Dr. R. D. Thomson, with a difiorent beam from that 

 used in constructing the first columns, and generally with different 

 specimens. 



JplrK'^gi? To water. To^^-Sfi^-d To water. 



Sulphate of potash . . . 2695 2*220 2 614 2-194 



Do. large crystal .... 2651 2-184 — — 



Anhydrous sulph. of soda 2-755 2-270 2-667 2-238 



Sulphate of soda (soluble) — 1-467 1*231 



Sulphate of zinc . 

 Sulphate of magnesia 

 Nitrate of potash . 

 Nitrate of soda . , 

 Nitrate of barytes 

 Nitrate of lead . . 

 Chloride of sodium 



— — *T1899 1-652 

 1-629 1-342 1-656 1389 

 2-016 1-661 1-962 1646 



— — Tl-973 1-716 



— — • T3-052 2-655 



— — T4-561 3-968 



— — T2-138 1-860 



Chloride of potassium . . — — T 1-848 1*607 



* T denotes oil of tarpentine. 



