CHEMICAL SCIENCE. 2G7 



tions of the anemometer, made at London, Blackheath, and Felixstow, on the 

 coast of Suffolk. From these it was seen that the relation of these three places 

 was as 0, 22, and 55. The instrument acted also as a clock, and the time 

 could be accurately marked upon the ozonized paper. 



Dr. Marshall made some remarks on his own observations during the last 

 twelve months, and stated that he had not been able to discover, though 

 assisted in the investigation by medical gentlemen, that there was any obvi- 

 ous connection between ozone and the state of health. 



UNWHOLESOMENESS OF LIGHTS. 



Recent experiments have proved that lights of equal intensity, obtained 

 from different materials, require very different lengths of time to generate 

 the same quantity of carbonic acid. The following is the relative time 

 required by the common materials : Olive-oil, 72 minutes ; Russian tallow, 

 75; common (French) tallow, 76; whale-oil, 76; stearic acid, 77; wax can- 

 dles, 79; spermaceti, 83; gas from common coal, 98; gas from fat or cannel 

 coal, 152 minutes. Coal gas, therefore, and especially gas from cannel coal, 

 is the least unhealthy of all ordinary lights ; which is contrary to the usual 

 opinion. Cosmos, June, 1858. 



DESTRUCTION OF INSECTS IN ORCHARDS, GARDENS, ETC. 



M. Mellot Brule, the distinguished horticulturalist (France), has recently 

 demonstrated, by experiment, the efficacy of the powdered proto-sulphuret 

 of iron (which has been before used for the preservation of timber), in de- 

 stroying noxious and annoying insects. 



The powder may be strewed over the ground around the roots of the tree, 

 or fixed on the surface of a collar surrounding the stem. No insect will pass 

 it; or, if they attempt it, they are immediately killed. The proto-sulphuret of 

 iron (black pyrites,) occurs as a mineral in various parts of France and Ger- 

 many, and is manufactured for the purpose of developing sulphuretted hy- 

 drogen, which is undoubtedly the effective agent in destroying the vermin. 

 Cosmos. 



NITRO-GLYCERINE, OR GLONOINE. 



Mr. A. G. Field, F. R. C., communicates to the London Pharmaceutical 

 Journal, the following account of the preparation and properties of glonome, 

 with its therapeutic effects : 



" In 1847, when chemists were intent on the production of gun-cotton, M. 

 Sobrero made known the fact that glycerine, when treated with a mixture of 

 sulphuric and nitric acids, yielded a similar compound, which he described 

 as an oily liquid, heavier than water, in which menstruum it was insoluble, 

 although readily dissolved by alcohol and ether. 



" According to this author, the smallest quantity of it was sufficient to 

 produce a most violent headache, from which he concluded it would prove a 

 most dangerous poison. 



" This consideration induced me to try and ascertain the best mode of 

 preparing this substance, and again examine its principal properties. 



"Preparation. After repeated experiments, I found the following the 

 best mode of preparation : One hundred grammes (1543.3 grs.) of glycerine, 

 freed as much as possible from water, and having a sp. gr. 1.202, were cau- 

 tiously, and in small quantities at a time, added to 200 cubic ccntini. (18 



