of Processes in the Five and Useful Arts. 349* 



arrangement may be adapted to the premises. It is only ne-j 

 cessary to state, that the highest point of the Thermosiphon: 

 should not in any respect exceed thirty feet, as it acts in this) 

 respect on the principle of the Torricellian column ; and I 

 prefer not to exceed twenty feet. Care must be taken also, 

 at all times to exclude the air completely, when filling the) 

 Thermosiphon ; air- plugs being placed where necessary, tor 

 permit the air to escape when filling, and to prevent a return;^; 



6. Mr Derbyshire'' s Embrocation for preventing or alleviating^ 

 seasickness. ': 



The inventor of this embrocation has secured it by patent.! 

 It is riiade thus : 



" Take of crude opium two ounces avoird. two drachms of 

 extract of henbane^ ten grains of 'powdered mace^ and two 

 ounces of hard mottled soap. Boil them in sixty ounces of 

 soft water for half-an-hour, stirring well : When cold, add 

 one quart of spij'its of wine at sixty degrees above proof, and 

 three drachms of spirit of ammonia. 



Rub a desert spoonful of this embrocation well in over the 

 lower end of the breast-bone, and under the left ribs, the latest 

 time you can conveniently do so previous to embarkation, and 

 again on board as soon as you have an opportunity. I^he 

 application must be continued till the sickness disappears. 



7. Method of preserving Fruit without Sugar. 

 You must use wide-necked bottles, such as are used for 

 wine and porter. Have the bottles perfectly clean. The fruit 

 should not be too ripe. Fill the bottles as full as they will 

 hold, so as to admit the cork going in. Make the fruit lie 

 compact ; fit the corks to each bottle, slightly putting them in 

 that they may be taken out the easier when scalded enough ; 

 this may be done in any thing which is convenient; put a 

 coarse cloth of any kind as the bottom of the vessel, to pre- 

 vent the bottles from cracking ; fill the vessel with water suf- 

 ficiently high for the bottles to be nearly covered in it ; turn 

 them a little to one side to expel the air that is contained in 

 the bottom of the bottle ; then light the fire ; take care that 

 the bottles do not touch the sides nor the bottom of the vessel, 



