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of condition for new normal places, he obtained a third and 
fourth ellipse, the latter by the assignment of weights to the 
several normals. The amount of outstanding error was 
thus reduced to a very small quantity, and the orbit was 
sufficiently accurate to correct the sextant-observations, and 
decide sundry points left ambiguous by the observer. Thus 
he found which limit of the sun had been compared with 
the comet at Chihuahua, and was able to make the assump- 
tion of an érror of two minutes in one of the recorded 
times of observation, and thus both to render the observa 
tions accordant, and to show their value. In a similar way 
the untrustworthiness of another sextant-observation was 
made manifest, and thus prevented from vitiating the com- 
putations, The errors of two sextant-measurements in each 
place were thus shown to lie within the limits of good ob- 
servation, and the aid of these very important auxiliaries 
Secured. 
The disturbing forces were computed for each of the six 
large planets for each fourth day during the period of the 
Comet’s visibility, and with the series of osculating elements 
thus obtained, he determined the discordances of every ac- 
cessible observation. Here, as everywhere in HupBarp’s 
Work, we find the indication of his scrupulous care in con- 
trolling his computations by the independent employment of 
different formulas, and of the tact by which he adapted 
Various methods to his purpose; this peculiarity, as well as 
his exquisite elegance in the mechanical arrangement, and 
the beauty of his chirography reminding one continually of 
CKE, many of whose scientific characteristics seem equally 
to have belonged to Huspparp,— though the fulness of 
years and opportunities happily accorded to the aecom- 
Plished astronomer of Berlin were denied to our departed 
4ssociate. True to his nature, he computed all the anoma- 
