„60 
For the solutions b and c only March 7 and 8 were used as first 
Jidda-group, as the next preceding observations are 4 days earlier. 
I adopted the mean of the 3 results a, 6 and c 
+ 2m 34593 
As the final result yielded by N°. 80 I adopt the mean of the 
results from the two journeys 
+ 2™ 35515 
e. Watch N°. 81. 
This watch was taken on the first journey to Mecca. About that 
time it seems to have gone fairly regularly, 
The following results were found for the difference of longitude. 
First we obtain by means of comparison of the results obtained 
at Mecca with those interpolated between the last preceding and the 
next following observations at Jidda : 
Febr. 14 + 2m 3674 
15 36.17 
16 30.99 
Mean + 2™ 3568 
Further 4 general solutions have been executed, I and III by 
quadratic, II and IV by linear formulae. Only for III and IV the 
deviating result of Febr. 21 at Jidda was excluded. 
I + 2™ 35:81 (+ 0:88) 
Il 35.39 (+ 0.85) 
Ill 35.78 | (+ 0.83) 
IV 35.22 (+ 0.83) 
It appears here, as before, that the exclusion of a deviating time- 
determination between others has but little influence. As results from 
the quadratic and from the linear formulae I adopt the mean of I 
and [II and that of II and IV 
+ 2m 35580 
and + 2 35.30 
and as final result the mean of the results obtained by the three 
methods, direct interpolation, linear and quadratic formulae 
+ 2m 85:58 
f Watch NE 34. 
This was taken on the 3 journey. According to the investigation 
of the results at Jidda its rate was very regular; it showed no progressive 
variation and only small accidental deviations. During the stay at 
