Notices respecting New Books. 63 



The image on silver iodide was amenable to the last two oxidi- 

 zing agents, but apparently not to the first one. 



A silver-bromide plate, after the image had been oxidized, 

 was allowed to come into contact with nascent hydrogen ; and 

 a partial restoration of the image was obtained, but the distinct- 

 ness was much marred by the reducing action that took place 

 on the silver bromide which had received no impression by 

 light. 



As a crucial test, however, both bromide and iodide films 

 were exposed moistened to the action of ozone obtained by the 

 ordinary electrical arrangements from perfectly pure oxygen ; 

 and in all cases the image was totally destroyed. Whilst the 

 film was still in the ozonized condition, it was again exposed, 

 and a feeble image, due to the new exposure, was developable, 

 whilst after destroying the ozone, a new exposure gave a vigo- 

 rous picture. 



From these experiments are to be deduced that the image 

 formed in the silver iodide is of the same nature as that formed 

 in the silver bromide, the difference between them being pro- 

 bably that in the former the atoms are more strongly bonded 

 than in the latter, that oxidation of the loose atom of silver 

 makes the image undevelopable, and that to this cause the 

 deterioration of the image on dry plates by keeping after ex- 

 posure is most probably due. If the red rays promote oxida- 

 tion, as has recently been asserted by Chastaing, the pheno- 

 mena observed by Draper and others, already alluded to, may 

 be readily accounted for. 



XI. Notices respecting Neiv Books. 



Report on the Administration of the Meteorological Department of 



India in 1875-76. Government Central Press. 

 Report on the Meteorology of India in 1875. By Heney F. 



Blanfokd, Meteorological Reporter to the Government of India. 



First Tear. Calcutta, 1877. 



^HE first of the above-named publications deals principally with 

 the official establishment by the Government of India of the 

 Meteorological Department on the 27th of September, 1875, sanc- 

 tioning a scheme of reorganization recommended in the author's 

 Report of the 26th of July, 1875. To this report the author's name 

 is not appended ; but, from a remark on the publications of the De- 

 partment, we believe it to be the production of Henry F. Blanford, 

 the Meteorological Eeporter to the Government of India. To this 

 report of the administration of the Department are appended some 

 extracts from a report by Mr. F. Chambers, which contain some 

 interesting notices. It appears from these extracts that the first 

 attempt at systematic Meteorological registration at Provincial 



