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Henry L. Bruner 
In the study of these moulting movements I experienced considerable 
difficulty at first on account of the failure of the supply of suitable 
material. This obstacle was finally overcome, however, by the applica- 
tion of court plaster, or similar material, to the head of the hzard. Such 
artificial exuvie formed a perfect substitute for the old stratum corneum 
and induced movements which were identical in every way with those 
which occurred under natural conditions. Protrusion of the eyes, with 
both stages well developed, scratching of the head or rubbing against a 
convenient object were all observed, the reaction following as promptly 
in specimens which had recently moulted as in those which were in the 
Fic. 10. Sceloporus undulatus, showing orbital protrusion of second stage 
x BY 
Court plaster on left upper eyelid. 
midst of the moulting process. Text Figs. 10 and 11 are from speci- 
mens of Sceloporus undulatus which were treated in this way. They 
show fairly well the amount of enlargement at the moment of maximum 
orbital protrusion. 
By the use of the court plaster method I have been able to observe 
the moulting movements in a considerable number of species and indi- 
viduals, and in the same individual under different conditions. In all 
cases observed the mechanism was not set in motion until the plaster 
began to dry. In some species, such as Anolis caroliniensis and Scelop- 
orus undulatus, the response was usually very prompt, but shy indi- 
