310 Sir Everard Home on the formation of fat, &c. 
certain portion of oil, and in those ova whose embryos con- 
sist entirely of soft parts, there is none. 
This conclusion is much strengthened by the peculiarity, 
which it has been my object in this paper to point out, of the 
tadpole laying up a magazine of fat before the metamor- 
phosis into a frog takes place ; it is, therefore, rendered 
probable, that a certain portion of oil is necessary for the 
formation of bone, and that the proportion in different ova 
corresponds with the greater or less degree of hardness of 
' 
the bones of the foetus. 
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