122 



This was analysed, and proved to be pure monoacetate of glycol. 

 Theory. Experiment. 



C 8 46-15 46-02 



H 8 . ... 7*69 7-80 

 O, 46-16 



100-00 



The following equation will explain the reaction which takes place 

 between the acid and the glycol : 



Qi H 4 \ ^ , C 4 H 3 O 2 \ o _ p 4 TT 4 Q I Q , C 4 H 3 O 2 } Q 

 H 2 J 4 C 4 H 3 OJ U2 4 H 2 | U4+ H J U2 ' 



The foregoing experiments were performed in the laboratory of 

 M. Wurtz. 



VI. " Experiments on some of the Various Circumstances in- 

 fluencing Cutaneous Absorption." By AUGUSTUS WALLER, 

 M.D., F.K.S., Professor of Physiology, Queen's College, 

 Birmingham. Received June 27, 1859. 



In some former experiments* I endeavoured to elucidate the phse- 

 nomeria of cutaneous absorption on the lower animals (batracia), by 

 immersing the hinder extremities in various solutions, and afterwards 

 watching the period at which the absorbed substances reached the 

 tongue, where their presence was detected by means of some reagent 

 applied to its surface ; as, for instance, a salt of iron, when the legs 

 were immersed in a solution of yellow ferro-cyanide of potassium ; 

 Prussian blue was then formed as soon as the ferro-cyanide was 

 brought to the tongue. 



Furthermore, I was able to detect, by the aid of the microscope, 

 the "lieux d' election," or preference spots, where the cyanide escaped 

 from the vessels. 



On the present occasion I shall endeavour to elucidate cutaneous 

 absorption on the higher animals, and, if possible, to give a more 

 definite view of this function, by determining, by accurate measure- 

 ment, the degree of rapidity, the peculiarities, &c., which it may 

 offer in various conditions. 



* Waller " Absorption of various substances through the skin of the Frog." 

 Frorieps Tagesberichte, 1851. 



