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PREFACE 



the work owes its original conception;, the Editor at once 

 perceived that, while, on the one hand, the total amount of 



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matter c.^itributea cuuld by no poBsibillty be compressed 



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into 



the r^niali compass uiigxiia.xij 



oridnally intended (even v*hen 



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1-^drced bv the Retrenchment oF some po>^^^oiis m his 

 opx.au- : 'ss vitally essential, and wliicli the authors of 

 thosG portions, on his representation, most readily agreed 

 to abbreviate) 



-on the 



other, those contributions bore 

 i'\ lence of having been drawn up with so much carr; and 

 preelsion, and elaborated with such consummate ability, 

 that any further attempt to reduce them withiu those 

 limits would hav- been at once presumptuous on his part 



and most injurious lo the efficiency of the work itself 

 It is hoped and believed that the instructions on eacl 



subject tiuated of ar^ 



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.ch as completely to fulfil the 



views of tht: Memorandum, in so far as it is possib^ 



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con- 



sisti^atlv .,^tii the nature o 



thcv should do so. 



f the sciences treated of, that 



are some — such .3 Ter- 



restrial Magnetian— which it is impossible to divest of ■' 

 certain degree of abetruseness, and m which no ul^^erra- 

 tions wortu recording can be made without the aid of 

 instruments and methods of observatioti and reduction de- 

 cidedly both nice and delicate. The s^.^uc may be said, 

 so' n , ' as the instruments are concerned, in Meteorology. 



meteorological observations of most import- 



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