316 Notices of Memoirs — A. P. Brown — Young Bacalites. 



can be heard ; it will not at all depend on the amount of the slip at 

 the centre of the area, i.e. it will be independent of the intensity of 

 the shock. 



I shall endeavour to show, in a later paper, that this theory of 

 the origin of earthquake-sounds accounts satisfactorily for all their 

 phenomena, so far as they are known to us. For the present, it will 

 be sufficient to point out that it explains (1) the fact that the sound- 

 area is not concentric with the disturbed area, and the sound-focus 

 is nearer the surface than the rest of the seismic focus ; and (2) the 

 fact that, in great earthquakes, the sounds are only heard within a 

 comparatively small area immediately surrounding the epicentrum. 



Authorities. — " Accrington Gazette," Feb. 16; " Accrington Times," 

 Feb. 16; " Altrincham Division Advertiser," Feb. 15; "Blackpool 

 Times," Feb. 13 ; "Bolton Chronicle," Feb. 16; "Bradford Observer 

 Budget," Feb. 16; "Burnley Express," Feb. 16; "Bury Guardian," 

 Feb. 16; "Chorley Standard," Feb. 16; "Craven Herald" (Skipton), 

 Feb. 16; "Darwen Post," Feb. 16; "Halifax Courier," Feb. 16; 

 " Heywood Advertiser," Feb. 15 ; " Huddersfield Chronicle," 

 Feb. 16; "Lancaster Guardian," Feb. 16; "Leeds Mercury," 

 Feb. 12 ; " Leigh Chronicle," Feb, 15 ; " Liverpool Mercury," 

 Feb. 12; "Macclesfield Chronicle," Feb. 15; "Macclesfield Courier," 

 Feb. 16 ; " Manchester Examiner," Feb. 12 ; " Manchester Guar- 

 dian," Feb. 12, 13; "Middleton Guardian," Feb. 16; " North wich 

 and Knutsford Chronicle," Feb. 16 ; " Oldham Standard," Feb. 16 ; 

 "Preston Guardian," Feb. 16; "Eochdale Observer," Feb. 13, 16; 

 " Wigan Observer," Feb. 13. 



Nature, vol. 39, p. 376 ; T. E. H. Clunn, The earthquake in Lan- 

 cashire, Nature, vol. 39, p. 390 ; J. Knowles, The earthquake shock 

 of February 10th, 1889, Manchester Geol. Soc. Trans., vol. xx. 

 pp. 155-157. 



For other information I am indebted to the kindness of the fol- 

 lowing gentlemen : the Secretaries of the Geological Societies of 

 Liverpool and Manchester, Mr. W. C. Carlisle (Stonyhurst Obser- 

 vatory), Mr. B. Hainsworth (Rossall), Mr. G. Hartnup (Liverpool 

 Observatory, Bidstow) Prof. E. Hull, F.K.S., and Mr. Isaac Eoberts, 

 F.E.S. (Maghull). 



{To he continued.) 



ITOOTICIES OIF DVniBIMIOIS/S. 



On the Young of Baculites compressus, Say. By Amos P. Brown. 

 (Proc. Acad. Nat. Sci. Philadelphia.) 



AT the meeting of the Academy of Natural Sciences of Phila- 

 delphia on March 10th, Mr. Amos P. Brown described the 

 young of Baculites compressus, Say, recently discovered by him in 

 some Cretaceous marl fx-om the vicinity of Deadwood, South Dakota. 

 Associated with them in the same material were several species of 

 Baculites, Scaphites, and Inoceramus. The young Baculites varied 

 in length from 1 to 3 cm., with a diameter of 04 to 2 mm. 



