136 



MR. RUMKER'S observations 



a Hydri. (Ann. Var. + 17".62.) 



Superior Culmination. 



Inferior Culmination. 



1823. 



Barom. 



Microscopes. 



II. 



ill. 



1823. 



Barom. 



Microscopes. 



I. 



II. 



III. 



IV. 



May 25 



26 



inches. 

 29.75 



29.56 



163 32 35.2 

 163 32 32.5 



33 29.8 

 33 23 



33 31 

 33 23.3 



33 6.4 

 33 1.2 



May 25 ... Mean 

 Refract, and Reduct 



Superior Culminat. 

 Inferior Culminat... 



Half Diff. S. P. D. 



163 32 33.8 

 +31.1 



33 26.4 

 31.1 



33 27.1 

 31.1 



33 3.8 

 31.1 



May 26 

 27 



June 3 

 10 

 11 



inches, 

 29.60 



29.66 



30.27 



30.02 



30.02 



57.5 



56 



50 



47.5 



44 



108 31 11.7 



„ ,; 14.7 



» M 32.5 



„ „ 28.4 



„ „ 33.4 



32 10.5 

 „ 16.7 

 „ 32.0 

 „ 24.8 

 „ 32.1 



31 54.7 



32 0.3 

 32 2.3 

 32 15.3 

 32 19.1 



163 33 4.9 

 108 22 20.9 



33 57 J 

 23 19.0 



33 58.2 

 23 4.1 



31 32.0 



„ 31.5 



„ 46.3 



„ 45.4 



„ 54.5 



33 34.9 

 22 37.7 



27 35 24.3 



35 24.4 



35 24.3 



35 24.4 



June 3 ... Mean ... 

 Refract, and Reduct. 



108 31 24.1 

 -9 4.2 



32 23.2 

 9 4.2 



32 8.3 

 9 4.2 



31 41.9 

 9 4.2 



Mean of 4 Microscopes . 



108 22 20.9 

 27° 35' 24".35 by 7 Obserr. 



23 19.0 



23 4.1 



22 37.7 



1828. 



May 28 

 29 

 31 



June I 

 6 

 7 

 12 

 13 

 16 

 17 



Barom. 



inches. 

 29.89 



29.83 



30.01 



30.05 



29.57 



29.44 



29.98 



30.03 



30.05 



30.19 



47 



47.2 



46 



44.7 



46 



46.7 



38 



36 



41 



38 



June 7. 7. ..Mean.. 

 Refract, and Reduct 



Superior Culminat. 

 Inferior Culminat.. 



Half Diff. S. P. D. 



Microscopes. 



28.1 



34.3 



25.7 



25.0 



25 



30.7 



30.8 



38.0 



42.0 



31 



27 49 31.1 

 -50.8 



27 48 40.3 

 332 37 45.8 



27 35 27.2 



II. 



49 30.4 

 34.0 

 27 

 28.5 

 29.2 

 28.7 

 32.0 

 33.0 

 32.5 

 31.0 



49 30.6 

 50.8 



48 39.8 

 37 50.1 



35 24.9 



III. 



49 36.2 



„ 34 



„ 33.3 



„ 32 



„ 34 



„ 34.2 



., 37.2 



„ 40.5 



„ 38.0 



„ 33.5 



49 35.3 

 50.8 



48 44.5 

 37 54.6 



35 24.9 



49 28 



„ 32 



„ 26.4 



„ 22.7 



„ 27.5 



„ 28 



., 34 



,1 36.5 



„ 47.0 



,, 37 



49 31.9 

 50.8 



48 41.1 

 37 41.8 



35 29.7 



1828. 



May 29 



June 1 



7 



10 

 17 



Barom. 



inches, 

 29.84 



29.99 



29.47 



29.72 



30.03 



42.3 



43.3 



51 



48.5 



51.5 



June 7 ... Mean ... 

 Refract, and Reduct. 



Microscopes. 



332 45 40.0 

 „ „ 40.0 

 „ „ 24.7 

 ,. „ 36.7 

 ,. „ 32.0 



332 45 34.7 

 -7 48.9 



332 37 45.8 



II. 



45 44.3 



„ 44.8 



„ 30.6 



„ 41.5 



„ 34.0 



45 39.0 

 7 48.9 



37 50.1 



III. 



45 48.8 



„ 49.0 



„ 35.6 



„ 45.0 



,. 39 



45 43.5 



7 48.9 



37 54.6 



IV. 



45 35.5 



„ 36.0 



„ 21.0 



„ 30.8 



„ 30.0 



45 30.6 

 7 48.8 



37 41.8 



Mean of 4 Microscopes 27» 35' 26".88 by 15 Obserr. 



Mean S. P. D. of a Hydri, Jan. 1, 1828 27° 35' 25".9 by 22 Observ. 



