BY J. H. MAIDEN. 465 



It is obvious that these figures teach but little, and cannot 

 rigidly be compared with otheis unless the hygrometric state o£ 

 the atmosphere at each place of experiment be given in all cases. 



Nevertheless it will be interesting to compare the following: 

 figures for hygrometric moisture: — Turkey (Dr. Letheby), 12 4 

 per cent ; his other figures fluctuating between 10-8 for German 

 and 13-4 for Maryland. Professor Church give the average per 

 centage of moisture in tobacco at 13 per cent. These results have 

 doubtless all been obtained in the more humid atmosphere of 

 England. 



Extract (water). 



It yields 49-36 percent of extract to water at 100° C. 



Dr. Letheby gives the yield of extract of Turkey tobacco at 

 60-6, and hissample contained 12 -4 percent of hygrometric moisture. 

 Calculated upon the dry leaf this would of course give a percentage 

 of 68-1 . The other percentages he gives (on the tobacco at 60° F.) 

 vary between 43-4 for Virginian to 64*4 for Maryland. 



Swedish tobacco is said to yield 50-64 per cent, of extract of 

 (Dingl : Poly tech : Journ : CCXXV. 615). 



Extract (Ammoniacal Ether). 



Hygrometric moisture... ... 10-55 



Chlorophyll and fat ... ... 6-2 



Nicotine 1-8 



Total per cent soluble in ether... 18*55 



Ash. 



It yields 18*7 per cent of ash. 



Dr. Letheby gives the percentage of ash in Turkey tobacco at 

 10-6, and Watts' Diet, at from 17-23. In this work we have 

 the ash of good Havana 16-16-8 (Letheby 18*6), inferior 

 sorts, 17'8-19-4 ; Letheby's figures also give German the maximum 

 of 22-6. Professor Church (" Foods," the South Kensington 

 Museum handbook) gives the ash of tobacco at from 13 to 28 jDer 

 cent. 



