on the Bones of Animals. ^ 149 



gave it again. Hb afterwards kiiled the 

 aiiinial, and ujx>n mspcctioa thought he ob- 

 served the appearance, wh'xh he expected; 

 viz. two layers of red bpnc inclosing ^ne bf 

 ^vhite, corresponding to the periods of the 

 raadder's being given or withheld. 



This experiment, and some others related by 

 l>u Ilamel, appear to be' conclusive in fcivour 

 ui' the theory, which he wished to estahEsh ; 

 and as they were conducted by a physiologist 

 of high character, the accuracy of tlie oh|- 

 servations could not liavc been doubted, had 

 these experiments stood alone. But when they 

 ^e compared with some of his own previous 

 Cixperimcnts, and those of other authors, it is 

 diihcuit to reconcile tliem. In some of D« 

 1 lameFs experiments, for instance, the bones 

 of a cock were tinged of a rose-colour through 

 their whole substance in sixteen days, and 

 those of young pigeons of a deep scarlet in 

 three days. In several experiments I have 

 made on the subject, 1 have found the bones, 

 of young pigeons tinged of a uniform rosc^ 

 colour, intenrally as well as externally, in 

 twenty -four hours. This communication of 

 colour to the whole substance of the o$seoug 

 system in so short a time, makes it highly im- 

 probable that ihe himinated appearance, re- 

 !narktM] \j\- Dn ILrv-l. was produced by th- 



