68 



pidoglio. Roma, Rend. Ace. Lincei, 

 (Ser. 5), 11, 2° sem., 1907, (729). [5(i70]. 



12805 

 Doberck, W. On tlae accuracy of 

 measures made by the principal double- 

 star observers. Astr. Xachr., Kiel, 177, 

 1908, (64-70). [7510 3200]. 12806 



Elements of the orbit of 



7 Virginis. Astr. Nachi"., Kiel, 177, 

 1908, (161-172). [7530]. 12807 



On 5 Orionis. 



Astr. 



Nachr., Kiel, 178, 1908, (363-3C4). 

 [7530]. 12808 



On the hypothetical paral- 

 laxes of double stars. Astr. Nachr., 

 Kiel, 178, 1908, (371-382). [7530]. 



12809 



On the orbit of C Cancri 



C. Astr. Nachr., Kiel, 179, 1908, (1-8). 

 [75.30]. 12810 



Dbrrie, H. Eine elementare Her- 

 leitung fiir das Keplersche Gesetz von 

 der Gestalt der Bahn. Arch. Math., 

 Leipzig, (3. Keihe), 13, 1908, (104-106). 

 [1110]. 12811 



Dolmage, Cecil G. Astronomy of to- 

 day. London (Seeley), 1909, (363, with 

 pis.). 20 cm. 5s. ; [review] London, J. 

 Brit. Astr. Ass., 19, 1909, (97). [0030]. 



12812 



Donic, N[ikolaj Nikolaevic]. Obser- 

 vations de I'eclipse totale de soleil du 

 29-30 aout 1905. St. Peterburg, Bull. 

 Ac. Sc, (ser. 6), 1, 1907, (661-689, av. 

 4 pi.). [4650 4700 4240]. 12813 



• Observations de recli23se 



annulaire de soleil des 16-17 mars 1904 

 a Pnom-Penh (Caml)odge). Bui. astr., 

 Paris, 23, 1906, (385-391). [4210]. 



12814 



Observations de I'eclipse 



totale de soleii des 29-30 aout 1905. 

 Bui. astr., Paris, 23, 1906, (391-393) ; 

 25, 1908, (377-404). [4660 4210]. 



12815 



Observations de Teclipse 



annulaire de soleil du 16-17 mars 1904 

 b, Pnom-Penh (Cambodge). Paris, Bid. 

 80C. astr. France, 1906, (367-3C)9). 

 [4210]. 12816 



Observations de reel ipse 



totale de soleil du 29-30 aout 1905. 

 Paris, Bid. soc. astr. France, 1907, (30- 

 31). [4210]. 12817 



Donitcb, N. v. Donic, N. 



Donitsch, N. V. Kobold, 11. 



Donner, Anders. Redogorelse for 

 fortgangen af de astrolotografiska 

 arbetena a observatoriet i Helslugfors 

 under tiden Juni 1904 till Maj 1905. 

 [Bericht iiber den Fortschritt der 

 astrophotographisclieu Arbeiten auf der 

 Sternwarte zu Helsingfors vom Juni 

 1904 bis Mai 1905.] Ofvers. F. Vet. 

 Soc, Helsingfors, 48, 1906, No. 4, (1- 

 11). [2010 7020]. 12818 



Redogorelse for fortgangen 



af de astrofotografi.ska arljetena a 

 observatoriet i Helsingfors under tideu 

 Juni 1905 till Maj 1906. [Bericht iiber 

 den Fortschritt der astrojjhotographi- 

 schen Arbeiten auf der Sternwarte zu 

 Helsingfors vom Juni 1905 bis Mai 

 1906.] Ofvers. F. Vet. Soc, Helsint-- 

 fors, 49, No. 3, 1907, (1-8). [2010 

 7020]. 12819 



Catalogue photographique 



du ciel. Zone de Helsingfors eiitre + 39'' 

 et +47°. Premiere serie : Coordonnees 

 rectilignes et equatoriales. Tome 111. 

 Cliches de 6'> k 9^- Helsingfors, 1908, 

 (V + 500,. 29 cm. Tome IV. Cliches 

 de9'>a 12^- Helsingfors, 1903, (111 + 

 318). 29 cm. [7040]. 12820 



— V. Kapteyu, J. C. 



Doolittle, Eric. The secular pertur- 

 bations of Mars from the action of 

 Mercury. Astr. J., Boston, Mass., 25, 

 1908, (21-22). [1300]. 12821 



The Wharton reflex zenith 



tube. Pop. Astr., Northfield, Minn., 14, 

 1906, (530-537, with text fig.). [2080 

 5100]. 12822 



Catalogue and re-measure- 

 ment of the 648 double stars discoveied 

 by Professor G. W. Hough. Publica- 

 tions of the University of PennsylvauiM, 

 Astronomical Series, Philadelphia, 3, 

 Pt. 3, 1907, (1-176, with tables). [7520]. 



12823 

 Doppler, Christian. Abhandlungeii 

 [lietr. Lichtheorie ; farbiges Liclit der 

 Doppelsterne]. (Ostwald's Klassiker der 

 exakten Wissenschaften. No 161.) Leip- 

 zig (W. Engelmann), 1907, (194). 19 

 cm. '3,60M. [7520]. 12824 



Douglass, Andrew EUicott. Illusions 

 of vision and the canals of Mars. Pop. 

 Sci. Mon., New York, N.Y., 70, 1907, 

 (464-474, with te.Kt fig.). [3200 5810]. 



1 2825 



Downing, A. M. W. Com])arison of 

 the star places of the Cape ('atalogue of 

 1680 stars for the epoch 1900.0 with 



