Influence of Corpus lutcum Extracts upon Plain Muscle 11 



and tixod in tlie recordinor apparatus. Three out of the trii experiments 

 show diminution of tone and inhibition of the "pendulum movements." 

 One shows diminution of tone onlv. Of the romaininor seven, one shows 



Fig. 9.— Cornu of cat-uterus (excised). Showing diminution of tone caused by corpus 

 luteum extract of cow. The immersion in corpus luteum extract was during the 

 period of time marked by the arrows. 



Fig. 10. -Cornu of bitch's uterus, excised. Showing increase of tone "^"-^ .''^^^^"f^Vr™! 

 frequency of the rhythmic contractions as the result of immersion in 5 pei cent, corpus 



luteum extract. 



an initial contraction followed by diminution of tone, and this again by 

 increase of tone. In the other six cases the results were very slight, or no 

 change at all could be observed. 



Intestine of Rabbit— Eight experiments were made upon portions 

 taken from the upper part of the jejunum treated in the same way as 



