366 Rorjal Society : — 



Prof. Galbvaith (Phil. Mag. Prof. Galbraith, off same 



Jan. 1855), his o^to selection, specimen as Mr. Campbell's. 



KO . . . 10-68 4-65 



NaO . . . 3-26 3-39 



Mr. Campbell, same specimen 



as Prof. Galbraith's. Mr. Foster. Prof. England. 



KO . . . 302 4-15 5-72 



NaO . . . 3-98 4-34. 6-89 



The difference in Prof, Galbraith's and Mr. Campbell's ana- 

 lyses is not owing, I presume, to any difference in the consti- 

 tution of the felspars, but most probably to the Professor's not 

 having taken out all the mica. 



These analyses leave the question of the quantity of potash 

 and soda in the felspar of the Three Rock Mountain thus : three 

 analyses by three different men give the soda in excess; two 

 by Prof. Galbraith give the potash in excess, that one his own 

 selection giving the smallest quantity of soda. With this evi- 

 dence before us, is it not rather premature to argue that this 

 mountain contains in its felspar a greater quantity of potash 

 than soda ? And it shows the clanger of making inferences as 

 to the composition of minerals constituting a large portion of a 

 mountain from one analysis, as done by Prof. Galbraith. How 

 many it requires to be able to judge I shall not say, but I think 

 those given, unless all selected specially as being like in general 

 character, cannot have much bearing on the matter, and prove 

 how much more is to be done before drawing conclusions from 

 one analysis, and that one different from all the others. Further 

 discussion, I think, must be useless, until Prof. Galbraith exhibits 

 portions of the specimens which he has analysed ; and my call- 

 ing for their public exhibition is, I doubt not, the reason why 

 my entering into this discussion is looked on by Prof. Galbraith 

 as an " interference." 



I am, Gentlemen, 



Yours, 



Francis M. Jennings. 



LI. Proceedings of Learned Societies. 



ROYAL society. 

 [Continued fi'om p. 309.] 

 April 19, 1855. — The Lord Wrottesley, President, in the Chair. 



nj'^HE following communication was read : — 

 -'- " Reply of the President and Council of the Royal Society to 

 an application from the Lords of the Committee of Privy Council for 

 Trade, on the subject of Marine Meteorological Observations." 

 [This Letter was communicated to the Society in pursuance of a 



