MODELS OF LIZARDS IN MODELLING-GLUE 279 



More difScult, however, than either fishes or snakes, are 

 hzards, frogs, and such subjects, which have legs and toes to be 

 considered, and therefore a description of the method of procedure 

 to be adopted in casting these creatures is here given. 



Casting and Modelling a Frog 



Some common frogs were procured, killed, and hardened 

 for a few hours in the solution Formula 3 1 . They were 

 then placed in various positions on a block of stone, or, rather, 

 upon the paper model of a block of stone, to which they were 

 affixed in characteristic attitudes by means of fine entomological 

 pins, one of these being used to support the head, the throat 

 of the subject resting upon the head of the pin. Plaster was 

 poured over the frogs and over the surface of the block on 

 which they rested, and from this resulted a mould which, 

 naturally, was deeply undercut in places ; the glue-composition 

 (Formula 96), however, made light of such difficulties, and 

 the models of frogs delivered nicely with care. From one of 

 these groups, the specimen shown as Fig. 2 on Plate XV. was 

 cut, and was laid upon a tablet for the purpose of illustration. 

 The model was then coloured from a living specimen, and, 

 although apparently easy, taxed — as did the snakes (Figs. 4 

 and 5) — the resources of the palette to the utmost. A more 

 detailed description of a similar process, applied to a lizard, 

 follows. 



Casting and Modelling a Lizard 



A large lizard, which happened to be the well-known and 

 but little-liked Heloderma suspectum or Mexican poisonous lizard, 

 was cast in the autumn of 1894, and is taken for the purposes 

 of this explanation. 



In this case the lizard was laid upon its stomach as if 

 walking, its head a little erect and turned to the left, a natural 



