1871.] On Intensity of Daylight in Eclipse of 1870. 511 



but the stage of excitement, which in adult cats passed gradually off in a 

 few hours, was followed by a condition marked by a want of coordination 

 of muscular movements, and presenting the most grotesque resemblance 

 to certain stages of alcoholic intoxication. This stage was followed in turn 

 by sleepiness and stupor, in which the kitten was left at night ; in the 

 morning it was found dead. 



Two observations have shown that these salts paralyze (in dogs and cats) 

 the inhibitory fibres of the pneumogastric ; they also seem to lower the 

 internal tension, but want of material has prevented me from ascertaining 

 how this is brought about. 



On rabbits neither salt, even in doses of a decigramme, seems to have 

 any effect, except perhaps a slight excitement. There is no dilatation of 

 the pupils, no now of saliva, and, if one observation can be trusted, no 

 paralysis of the inhibitory fibres of the pneumogastric. 



No marked difference was observable between the two salts, except 

 that the morphia-salts seemed rather more potent than the correspond- 

 ing codeia bodies. 



The salts of deoxy codeia and deoxymorphia given by mouth or by 

 subcutaneous injection in doses of a decigramme, produced in adult cats, 

 almost immediately after exhibition, a series of convulsions much more 

 epileptic in character than tetanic. In one case there was a distinct 

 rotatory movement. 



In a few minutes these convulsions passed away, leaving the animal 

 exhausted and frightened. Then followed a stage of excitement with 

 dilated pupils and flow of saliva, very similar to the effects of the tetra- 

 codeia and tetramorphia salts, but less marked. 



Doses of half a decigramme given to adult cats produced the stage of 

 excitement only, without the convulsions. 



In no case, with any specimen of product, has vomiting been witnessed ; 

 like the tetracodeia and tetramorphia products, the deoxycodeia and de- 

 oxymorphia salts appear to paralyze the inhibitory fibres of the pneumo- 

 gastric. Trials with rabbits gave only negative results. 



No marked differences could be observed between the hydrochlorates 

 and hydrobromates of deoxycodeia or deoxymorphia. 



> 



VI. u On the Measurement of the Chemical Intensity of Total Day- 

 light made at Catania during the Total Eclipse of Dec. 22, 1870." 

 By Henry E. Roscoe, F.R.S., and T. E. Thorpe, F.R.S.E. 

 Received June 15, 1871. 



(Abstract.) 



The following communication contains the results of a series of measure- 

 ments of photochemical action made at Catania in Sicily, on Dec. 22nd, 

 1870, during the total solar eclipse of that date, with the primary object 

 of determining experimentally the relation existing between this action 



