Newton's lantern slide catalogue (1920s)

43, Museum Street, London, W.C.l. 181 THE EVOLUTION OF A FROG-ContUiued IG Showing final stage of develoiiinent of tail to be absorbed as food in a later stage. Also the extent of development of xiosterior legs before the appearance of the fore limbs 17 Showing the fore limbs in process of unfolding, Alimentary canal much diminished in size, and situated almost entirely on right side Commencement of the Carnivorous Period. 18 Almost sudden appearance of considerably developed fore limbs, and equally sudden disappearance of alimentary canal, where the latter is visible both fore limbs have not yet appeared. Also showing fore limbs do not appear simultaneously, either right or left coming first 19 Tne animal now leaps ashore. The Tadpole is becoming a Frog. The mouth has become wider, the abdomen shrunken. Transverse processes of vertebrae developing, and more Frog-like appearance evident, and being as yet unable to catch its own food, it begins living at the expense of its tail 20 Same period as No. 19. Caught in the gra8« near pool and radiographed through the side, showing partial ab.'Orption of tail. Appearance of stomach, absence of alimentary canal. Compare with Radiograph of same position in Herbivorous period, ^ 0 . 15 21 About four days later than No. 20, showing the tail quarter part absorbed, and the long style of hinder-end of backbone, and produc d extremities of haunch-bones coming more plainly into view 22 Showing tail three-quarters absorbed, and legs growing longer 23 Showing tail externally completely absorbed, but portions still visible internally, aud further development of the tranverse pro- cesses of the vertebrae 21 Complete absorption of all trace of tail, and the young Frogs through living on their own tissue have become much smaller. Bony skeleton more developed. Tongue visible through the intermandibular space. First appearance of portions of hard undigested food 25 Showing the young Frogs, now able to capture their own food, regaining flesh. Further appearance of hard undigested portions of food. Compare v)ith No. 23 26 Showing appearance and gradual development of lower jaw-bone. Further growth and ossification of the skeleton 27 Showing ossification of upper jaw-bone—Verte- bral column wider and more defined—In specimen at bottom right corner the two cerebral hemispheres of brain are visible 28 Showing further arowth of the Frogs, lengthening of limbs, and base of jaw-bone commencing to articulate with the vertebral column Compare with No. 28 29 Showingpartial ossification of joints of fore limbs 30 Further stages of ossification of joints of fore limbs, and of the articulation of jaw bone with vertebral column 31 Showing a greatly increased ossification of apex of vertebral column, previous to complete articulation with jaw-bones 32 Showing three stages of development of the cartilage of interior of head 33 Showing jaw-bones now articulated wildi verte- bral column, transverse processes of vertebrae longer, and in the centre Frog the large free tongue may be seen in the inter- mandibular space 84 Young Frog, showing its characteristic deeply- notched free tongue 35 Same period aa No. 34, radiographed through the side and showing an almost straight vertebral column and a thick well-developed tongue with its tip pointing down the throat 36 Showing further stage of ossification of the articulation of jaw and vertebral column, The innermost igit of top specimen swollen —male, In bottom specimen all the digits equal in size—female 87 Showing a larger space at the base between upper and lower jaws, Api^earance of a ball and socket arrangement in joint of fore limbs 38 Same period as Number 87, radiographed through the side, showing development of a curve in vertebral column, Compare with No. 35, Also the relative positions of the urostyle and extension of haunch-bones, when in the act of leaping 39 A fully-developed Frog. In fore limbs showing four digits and radius and ulna completely fused together, a narrow line indicating the union. In hind limb, five toes and tibia and fibula fused 40 An old frog witb broken leg. The' hind legs placed in a position to show the separate bones of the elongated ankle and the “ tarsal tubercle,” or well-known hint of a sixth toe For Slides on the Evolution of a Chicken see page 204. bfy fish life. By arrangement with Francis Ward, M.D., F.Z.S., F.R.P.S., we are privileged to publish the two following groups of slides from original negatives taken by him, and which appear in his well-known books, “ Marvels of Fish Life,” and ” Animal Life under Water.” Beautifully Painted Slides, 6s. to 7s. 1 Young Pike. 2 Young Pike in weeds. 3 Pike, third year. 4 Pike watching prey. 5 Pike advancing to attack. 6 Pike suddenly appears. 7 Pike disgusted after failure. 8 Perch ready to attack. 9 Perch advancing. 10 Perch in the open. 11 Perch paling with fear. 12 Perch eggs. 13 Perch hatching. 14 Ruff. 15 Carp. 16 Carp, Mouth of, Open. 17 Carp, Mouth of, Closed. 18 Carp, Throat teeth of. Qd. each^ Plain Slides, 2s, Qd. each, 19 Carp; Throat teeth showing triangular cartila- gerious pad. 20 Crucian Carp, 21 Gudgeon. 22 Chub. 23 Chub. Throat teeth apart. 24 Chub. Throat teeth showing triangular car- tilagerious pad axproximatecl. 25 Dace. 26 Rudd. 27 Rudd taking worm. 28 Tench. 29 White Bream. 30 Stone Leach. 31 Stone Leach concealed. 32 Eel. 33 Stickleback buildinsr e^t I . '