all sensibility. I'his singular discovery made Mous. Hrocca susjiect that this tati 't i i-i'iisi . itj might i•• a? perfeci as that ob taini d by anesthi tic agents- He determined to ni ike ex atriments wiib it. and found that tbe staioi i iusensibiliiy produced was as perfect a? that obtained by tbe use ol ether and :hio roform. Threei xperimi ats i ul of five attempts are reported as successfi i. In oneoi these