1867.] Chemical Intensity of Total Daylight at Kew and Para. 41 



4. CgH^O^ by the action of hydrochloric on hemipinic acid ; thus, 



C,,H3,0, + HCl=C8HeO, + CO,+CH3Cl. 



5. C^HgO^ by the action of hydriodic acid on hemipinic acid ; thus, 



C,AoOo + 2HI=C,HA + CO, + 2CH3l. 

 In the second part of the paper the properties and the preparation of a 

 new base prepared from narcotine are described. "When narcotine is heated 

 for from six to eight days with strong hydrochloric acid at 100°, two mole- 

 cules of chloride of methyl are given off, and the chloride of the new base 

 formed. The reaction which takes place is 



C,,H,3N O, + 2 HCl = C,,H,3N O, + 2 C H3CI. 

 This base we have called methyl-nor-narcotine \ it forms an almost white 

 amorphous powder insoluble in water and ether, slightly soluble in alcohol ; 

 it is easily soluble in carbonate of sodium, by which means it may be sepa- 

 rated from narcotine. None of its salts form crystalline compounds (the 

 chloride, sulphate, and nitrate have been made) . In the paper of which 

 this is an abstract, mention is made of two other new bases derived from 

 narcotine ; these have not as yet been described. They are the dimethyl 

 and nor-narcotines, the first being the product of the action of hydrochloric 

 acid for a short time on narcotine, and the latter the product of the action 

 of strong hydriodic acid on narcotine. The reactions may be written 

 C22H,3N 0, + HCl=C,iH,,N 0, + CH3Cl 



and 



C,,H,3N 0, + 3H I = C,3H,,N O. + SCHgL 

 There exist, therefore, four narcotines : — 



1. Ordinary narcotine, or trimethyl nor-narcotine, C22H23N O^. 



2. „ „ dimethyl nor-narcotine, C2iH2iN O^. 



3. „ „ methyl nor-narcotine, C2oHj9N O^. 



4. „ „ nor-narcotine, CjgHj.N O^. 



The descriptions and properties of the first-mentioned new bases will 

 form the subject of a future communication. 



VIII. On the Chemical Intensity of Total Daylight at Kew and 

 Para in 1865-67.'' By Henry E. Roscoe, F.R.S. Received 

 May 14, 1867. 



(Abstract.) 



This communication contains the results of a regular series of mea- 

 surements of the chemical action of daylight, carried out at the Kew 

 Observatory, through the kindness of Dr. Balfour Stewart, according to 

 the method described by the author in the Philosophical Transactions 

 for 1864, p. 605. The observations extend over a period of two years, 

 from April 1, 1865 to March 31, 1867. The second part of the com- 

 munication gives the results of observations upon the Intensity of the 

 Chemical action of Sunlight under the Equator, made at Para in lati- 

 tude 1° 28' S. during the month of April 1866. - 



