SCIENCE- GOSSIP. 



2-Jl 



A remarkable feature in connection with this 

 invention is. that it serves the purpose of a camera 

 ami projector combine I. (.lias dispensing with the 

 use of two apparatus, one for taking the photo- 

 graphs, the other for displaying ( hem, as is the ease 

 with I he ordinary celluloid film. All that is neces- 

 sary is to have a circular "lass plate ready sensi- 

 tised, and then placed within the instrument, in a 

 dark room, when the amateur photographer, after 

 arranging thejapparatus in position, simply removes 

 the cap and turns the handle at the required speed 

 until he reaches a check which informs the Operator 



Fig. 4. 

 Laxterx and Ka.mmatouraph. 



that about GOO pictures have been taken on the 

 plate. The cap is replaced, the instrument returned 

 to a dark room, the negative plate developed, and, 

 when dry, printed in the ordinary manner by con- 

 tact. Thus it will be seen that moving pictures of 

 important or entertaining events may be taken 

 with this simple arrangement by persons of ordinary 

 ability, and exhibited to their friends within an 

 hour or two on a screen showing moving pictures 

 about 6 feet square in clear detail. The cost of 

 this apparatus is £6 10s., the negative and 

 positive plates being 2s. 6d. and 3s. for subject 

 plates. On account of its simplicity and compara- 

 tively small cost Mr. Kamm's new instrument will 

 make quite a revolution in the exhibition of moving 

 pictures. Especially is this the case, as by this 

 means the duration of exhibition of each picture is 

 lengthened, thus obtaining- a prolonged view of the 

 subject under observation. 



"Journal op Malacology."— The December 

 number of the " Journal of Malacology " completes 

 its seventh volume and its tenth year. In the 

 part under consideration Mr. Walter Collinge de- 

 scribes a new species of Voronicclla from the 

 Fiji Islands, but gives no figure. Mr. H. H. 

 Bloomer gives notes on some Anodonta cygnea 

 with deformed gills, and Mr. F. J. Partridge records 

 a reversed shell of Helicigona lapicida. 



BOQKSTOREaD, ,, 



wsm 



NOTICES BY JOHN T. CARRINGTON. 



By Land and S7ty. By the Rev. John M. 

 Bacon, M.A., F.R.A.S. x + 275 pp., 9 in. x 6 in., 

 with 4 illustrations. (London : Isbister & Co., Ltd., 

 1900.) 7s. fid. 



As a popular account of many aerial 

 and other expeditions, Mr. Bacon's work will find 

 numerous interested readers. It is rathe. ,,, a 



book for the encouragement of ballooning, than a 

 scientific treatise, consequently its chapters follow 

 each other with a pleasant flow of words that 

 captivate the reader even against his will. Many 

 of the observations with regard to the movemi 

 of sound-waves are interesting, as are some of the 

 author's conclusions. Still, we do not always agree 

 with him. One of these is, that in no case could 

 he trace an echo from a cloud. Possibly his sound- 

 waves were not sufficiently strong, and we should 

 like to ask how he explains the roll of thunder. 

 The curious effects of sound-waves rising from 

 earth to the higher altitudes will be read with 

 interest. The author has given considerable atten- 

 tion to the travelling of sound, so has much to say 

 . about the subject. One of the pleasures of the 

 book is that one frequently comes on an unexpected 

 and suggestive paragraph giving a new idea of 

 facts. For instance, it is pointed out that what 

 strikes an observer from a balloon while crossing 

 the dense city of London is "the large proportion 

 that open spaces bear to the actual mass of bricks 

 and mortar." This arises from the fact that to 

 passers in the streets the rows of house.- always 

 hide the gardens and spaces between, all of which 

 are visible from a balloon. As an example, we 

 may mention that there is an illustration given, 

 taken from a photograph by Mr. Bacon whilst 

 passing at an elevation of 1,000 feet over Clifton, 

 near Bristol. The author's style of writing is 

 picturesque and very readable. 



Lord Lilford : a Memoir by his Sister. xxiii + 

 290 pp., 8£in. x 5|in., with portrait, 17 plates and 

 illustrations in text. (London : Smith. Elder. & 

 Co. 1900.) 10s. fid. 



There can be few readers of this magazine 

 who are unaware of the eminence as an orni- 

 thologist of Thomas Littleton, fourth Baron 

 Lilford, F.Z.S., a pasi President of the British 

 Ornithologists' I'nion. whose demise was noted in 

 these pages in July 189fi. This memoii by his 

 sister will be welcomed, as it contains many ex- 

 tracts from Lord Lilford's correspondence, showing 

 throughout that real love of Nature which was 

 bis characteristic The book is prefaced with an 

 introduction by the late Bishop of London, which 

 is an appreciation of Lord Lilford's personal cha- 

 racter, Bishop Creighton having frankly confessed 

 it was beyond bis power to estimate him as an 

 ornithologist. The book is handsomely illustrated 

 •by Messrs. A. Thorburn, G. E. Lodge. F D. 

 Drewitt, F. Smit, and from photographs. 



