102 Chronicles of Science. [Jan., 



growing plants, and he considers the generation of ozone in the 

 process of vegetation to be one of the appointed means of nature 

 for purifying the atmosphere from pernicious organic compounds. 

 Dr. Daubeny, in his observations, used both Schonbein's paper, 

 and the sulphate of manganese paper, but considers the first," if pro- 

 tected from light, to give the most reliable indications. It was 

 admitted, however, by Dr. Daubeny himself, and most of the 

 speakers who joined in the discussion, that more accurate tests for 

 ozone are wanted. In reply to a question put by Dr. Frankland, 

 the author remarked that the outbreak of epidemics was often 

 ascribed to a deficiency of atmospheric ozone, but he had no evidence 

 on the point. 



In the course of the discussion which followed the reading of 

 Dr. Daubeny' s paper, Dr. Gilbert expressed some doubts of the 

 identity of the ozone-like emanations from growing plants, and the 

 odorous substance produced by the slow combustion of phosphorus 

 in moist air. Dr. Odling mentioned also that he had found some 

 of the properties of ozone wanting in the odour evolved on mixing 

 permanganate of potash with an acid. 



In closing the discussion, the President (Dr. W. A. Miller) 

 observed that no one doubted the existence of ozone in the atmo- 

 sphere ; but it must be admitted that, as yet, the proof was very 

 imperfect. 



On the same evening, Mr. W. N. Hartley gave an account of 

 a new body called " chlor-sulphoform," C 2 Cl 2 §3. 



The next communication was by Messrs. Chapman and Thorpe, 

 who gave a continuation of the paper mentioned above. It detailed 

 experiments on the oxidation of mannite and glycerine by chromic 

 acid, by which it seems only formic acid is produced. 



Mr. Chapman afterwards read a short paper " On the Synthesis 

 of Butyiene," which he has obtained by the action of zinc ethyl on 

 mono-brom-ethylene . 



De. Frankland's Lecture Notes tor Chemical Students.* 



'Lecture Notes for Chemical Students/ by a Professor who 

 stands in the position of the first teacher of the Science in England, 

 must necessarily command a large share of attention ; and these 

 notes will receive it no less on account of the position of the author 

 than the essentially novel character of the book. 



We may, at the outset, express our regret that Dr. Frankland 

 has not published a full educational treatise on the Science. This 

 book he correctly describes as a skeleton, which the student is 

 himself to clothe with already known facts. For these he is 



* ' Lecture Notes for Chemical Students, Embracing Mineral and Organic 

 Chemistry.' London : Van Voorst. 1866, 



