26 Herrich^s Auroral Register. 



1839. 



May 30 Clear. No A.B. to 10". 



31 Clear. A.B. seen.* (94) 



June 1 Ov't. Obs. impos. to 10*", and probably all nig-lit. 



2 Mostly clear: clouds 10° hio;h in W., N. and N.E. ; no A.B. above. 



3 Ov't with oc'l breaks in cl'ds. Obs. impos. to 10'', and prob. later. 



4 Ov't ; beo;an to rain at lO"". Obs, impos. to 10'', and d's all night.* 



5 Ov't. Obs. impos. to 10'', and doubtless later. 



6 Beautifully cl'r and calm : A.B. seen; very slight dawn in N.* (95) 



7 Mostly clear; gradually clouding from 9'' to 10''.* (96) 



8 Ov't. Obs. impos. to 10'', and doubtless all night. 



9 Cl'r at 10'' except N. hor. : no A.B. vis., and p. none to 10" lO''^ 



10 M'y cl'r, low cl'ds in N". hor. : no A.B. vis. to 11'', and prob. none. 



11 Clear, but no A.B. to 10". [ing and night. 



12 M'y ov't; oc'l breaks ; no A.B. then seen : obs. nearly impos. even- 



13 Ov't. Obs. impos. to 10'', and probably later.* 



14 Clear. No A.B. to 10'', or at 1'' of 15th. [very good. 



15 Clear. No A.B. at 11", and prob. none previous, but the obs. not 



16 Clear. No A.B. to 10". 



17 Ov't with dense haze. Obs. impos. to 10", and doubtless all night. 



18 Ov't to 10", and later. Cleared during the night. 



19 Clear. Moon interferes. No A.B. to^lO^". 



20 Ov't about N. Obs. impos. to 10", and probably all night. 



21 Ov't. Obs. impos. to 10", and doubtless all night. 



22 Ov't. Obs. impos. to 10", and d's later: cleared off during night, 



23 P'y cl'ded, but an A.B. of much brightness w'd have been vis. if pres- 



24 Ov't: obs. impos. to 10", and p. all night. [ent: no A.B, to 10". 



25 Clear. No A.B. to lOj". Moon nearly full. 



26 Ov't in N. Obs. impos. to 10", and probably later. 



27 Ov't. Obs. impos. to 10|^", and doubtless all night. 



28 Ov't; some rain. Obs. impos. to 10^", and probably all night. 



29 Clear. No A.B. to 10". Moon rises" about 10". 



30 Clear : no A.B. to 10" 10"', or perha])s there is a faint I't in N.N.W.* 

 July 1 Cloudless but slightly hazy. No A.B. to 10". 



2 Ov't, rainy. Obs. impos. to 10", and doubtless all night. 



3 Mostly clear. A decided A.B.* (97) 



4 Mostly clear. No A.B. to 10", or possibly a very faint light. 



5 Clear. No A.B. to 10". 



6 Clear. No A.B. to 10", 



7 Clear. No A.B. to 9" 40™, 



8 Mostly ov't. Obs. impos. to 10", and doubtless later. 



9 Mostly clear. No A.B. to 11". 



10 Mostly ov't. Obs. impos. to 10|". 



11 Thunder shower during ev'g. Frequent lightning after it passed.* 



May 31st. — A low ill-defined band in N., about 3° bigli at vertex, at lOh; horizontal extent 

 about 30° or 35° ; little change up to lOh. No streamers. 



June 4th. — Clouds liohter near N. horizon. Are they thinner there, or is there an A.B. be- 

 yond ? 



June 6th. — Watched at lOh 10m a short time. No arch, but only a dim illumination. At 

 lOh 40ra Mr. E. P. Mason saw bright streamers 10° high, and arch 1° high. 



June 7th.— A.B. Distinct band of illumination about 5° high ; without much change to IQli, 

 but clouds obscured parts of it. No streamers to lOh. 



June 13th. — Mr. A. B. Haile tells me that at 111) .5m the clouds lifted in the N. and left a long 

 narrow space, in which the light appeared unusual ; perhaps an aurora. 



Juue 30th. — I am uncertain, but suspect a very slight A.B. 



July 3d.— Several streamers about N. 15° E., about 12° or 15° high. No others seen up to 

 llh, but clouds interfere greatly. 



July 11th.— Clouds breaking away about IQh. Probably no A.B. up to lOh 10m, but at times 

 I suspected a faiut light. 



i 



