360 Mr. J. Glaislier's Remarks on the Weather 



expressed. In such a case this supposed bibasic prusside and 

 the nitroprusside would stand in a very simple relation : 



Fe^ Cy6 + 2R, 

 IVCy^NO + 2R. 



The complicated formula required by the analyses of all 

 the nitroprussides might be resolved into 2(Fe^ Cy^ NO-f 2R) 

 + (Fe Cy^ NO+ R), in which the latter member is constituted 

 on the same type, but more cyanogen is displaced by the ni- 

 trous oxide. It will not excite surprise, after what has been 

 learned in the previous inquiry as to the obstinate manner in 

 which the nitroprussides unite with cyanides from which they 

 are not removable by any means tried, that a salt constituted 

 on the same type should unite with the true nitroprussides 

 and form an integrant conjugate compound which is not broken 

 up by crystallization. It appears therefore very probable that 

 the true formula of the nitroprussides may in reality be 

 Fe2Cy^NO + 2R, and that further research may eliminate 

 this compound. Hitherto this has not been done, and the 

 only formula which correctly expresses the analysis is Fe^ Cy^^ 

 3NO + 5R, which on theoretical, but on no other grounds, 

 may be resolved into 



2(Fe2Cy^NO + 2R) + (FeCy2NO+R). • 



I trust soon to be able to present to the Society another 

 memoir on the prussides, which will confirm experimentally 

 some of the views theoretically supported in the present com- 

 munication ; but at present I submit the previous results with 

 a view of drawing attention to this interesting class of salts, 

 and with a perfect conviction that future research will sim- 

 plify and explain the remarkably complex and unsatisfactory 

 formulae which I have been obliged to adopt, without believing 

 them to be the correct expression of the constitution of the 

 salts. 



XLIV. Remarks oil the Weather during the Quarter ending 

 March 31, 1850. By James Glaisher, Esq.^ F.R.S., 

 F,R.A.S.i ^^d of the Royal Obsen)atory, Gree?iwich*. 



AT the beginning and towards the end of the quarter there 

 was much snow; the amount of rain was less than usual. 

 The weather was mild in February and severe towards the 

 end of March. 



* Communicated by the Author. 



