PHYSIOLOGY OF ORGANIC LIFE. 117 



large in my PHYSIOLOGY, as well as in two 

 papers published in the MEDICAL JOURNAL for 

 the year 1799, I shall merely observe in this 

 place, that the object which I had principally 

 in view, was to show, that the ideas entertained 

 on it by Dr. HAIGHTON, and which have been 

 published in the PHILOSOPHICAL TRANSAC- 

 TIONS, were altogether erroneous ; that he had 

 discarded and rejected all analogy whatever, 

 and the evidence which is furnished to ns by 

 vegetables, by fish, and by the amphibia, as 

 well as by other classes of animals. Instead of 

 taking the actual existence of a foetus, as consti- 

 tuting the only infallible test of animal impregna- 

 tion, he assumed the formation of a corpus luteum 

 in the ovariurn for the evidence of it. I proved 

 that the very facts which he had advanced were 

 decisive in showing he had proceeded from 

 false assumptions ; that in all those cases in 

 which he divided the fallopian tube of one side, 

 and left the one on the opposite side, perfect 

 and undivided, although there were corpora 

 ititea in both ovaria, there were foetuses only in 

 the perfect, but no traces whatever of a foetus 

 in the mutilated side; that although oestrum 

 had produced an evolution of the ova in both 

 oraria, impregnation was apparent only in the 

 perfect one. Notwithstanding these facts which 

 he himself had obtained, he concluded that the 

 existence of corpora, In tea was the test of im- 



