No improvements of form have been observed , in the other animals , since the first dawnings of zoology ; .
We must , therefore , believe improvements , to have lost the power of production , rather than to have attained all the objects of improvements ' desire .
No improvements of form have been observed , in the other animals , since the first dawnings of zoology ; and we must , therefore , believe them , to have lost the power of production , rather than to have attained all the objects of their desire .