10 



SEA BATHIXG. 



4 drams; from 7 to 12 3-ears, from 2 to 

 6 drams ; from 12 to 16 years, from 2 to 

 12 drams, and all above that from 2 drams 

 to 3 ounces. The discoverer aforesaid, 

 took eight ounces at once, without incon- 

 venience, except a sliglit fatigue and drow- 

 siness. Whei'c the patient is much re- 

 duced at commencement, the doses should 

 be gradually increased till the fever is 

 cured, and then mix a draught of cinna- 

 mon and sugar infused in good wine, with 

 a dose of from 4 to 8 ounces per day. In 

 obstinate fevers,, the dose to be so large 

 as to produce more exhaustion and more 

 pain in his head for 24 hours, than would 

 have been from the paroxysm alone; but 

 in succeeding paroxysms it is proper to 

 administer large doses in the intermissions, 

 and much smaller ones at the beginning of 

 the paroxysms. Quhi quina should on 

 no account be used at the same time. 

 When fever is accompanied with worms 

 and other disorders^ other medicines 

 should also be used. 



Preparation. — Select the most dry and 

 transparent gelatine; dissolve it in a sand 

 bath in three parts water, add equal parts 

 of sugar and some drops of orange flower 

 water. The sugar and orange flower wa- 

 ter, serve to disguise in some degree, the 

 insipidity of the gelatine. The gelatine 

 may also be prepared in cakes and kept 

 for any length of time, as follows, viz: 

 Transparent gelatine and sugar, equal 

 weight of each, or one part of each and 

 three parts or weight of water. A small 

 quantity of orange flower water, and 

 pour it into a glass inould which contains 

 as many superficial inches as there are 

 drams of jelly in tlie mixture. When it 

 becomes hard take it out of the mould and 

 lay it on a wire grating, formed in like 

 manner of squares of an inch each. When 

 it is almost dry, cut it according to its di- 

 visions. When these cakes are wanted 

 for use, nothing more is necessary than to 

 dissolve them in the smallest quantity of 

 water, and thus to take them in a liquid 

 form, or they may be suffered to melt in 

 the mouth. 



From the Pliilosopliical Tr.inssctions. 

 INCREASE OF VELOCITY IN MACHINERY. 



The most advantageous mode of increas- 

 ing velocity by a series of wheels, is to 

 adjust them so that the multiplication of 



velocity will proceed in a geometrical 

 progression. 



TO MAKE LITHOGRAPHIC PENCILS. 



Mix the following ingredients : Soap, 

 three ounces ; tallow, two ounces ; wax, 

 one ounce; when melted smooth, add a 

 sufficient quantity of lamp-black, and pour 

 it into moulds. 



From Silliman's Journal. 



STEPiEOTYPE METALOGRAPHIC 



PUINTIXG. 



Take two plates of very soft iron of 

 moderate dimensions, give one face of each 

 a very true and fine polish, so that when 

 applied by these surfaces, they will uni- 

 formly fit and adliere together. Moisten 

 two slips of printed newspaper, or parts 

 of a leaf from a book oi the size of the 

 plates, apply one to the polished face of 

 each plate, and interpose between tliem a 

 fold or two of silk paper, and then clamp 

 the plates together. Give them a gentle 

 heat over the fire, then place them in a 

 vice and apply a strong power; on separ- 

 ating them and gently removing the paper 

 the letters will be seen distinctly formed 

 on the faces of the two plates. As printers 

 ink is formed of lamp black and oil upon 

 which acid acts very little, the faces of ihe 

 plates may be slightly touched over with 

 dihited sulphuric or nitric acid, which if 

 skilfully applied, acts on the iron and leaves 

 the letters raised. When the printers' ink 

 contains some bees-wax the experiment is 

 more complete. These plates when once 

 formed may be converted into steel on 

 the plan of Mr. Perkins, after which they 

 would probably print 10,000 or 20,000 

 copies without being materially defaced. 

 An expert mechanic with proper machin- 

 ery, could in a day or two, form a suffici- 

 ent number of plates to print off" 20,000 

 copies 500 pages of an octavo volume. 

 Other metals as copper, brass and type- 

 metal, with slight variations can all have 

 letters transferred to them in the same 

 manner, and can be used as printing plates, 

 but none of them will have the durability 

 of Iron. 



From the Eiicycloineiihi Americana. 

 SEA BATHING. 



Sea BATHING IS BENEFICIAL in all dis- 

 eases of the glands of all kinds, and of 

 the skin in scrofula and a scrofulous pre- 



