———— 
A WEEKLY ILLUSTRATED JOURNAL OF SCIENCE 
“To the solid ground 
Of Nature trusts the mind which builds for aye.’ 
> _WORDSWORTH 
No. 16] 
THURSDAY, PEBRUARY ye 1870 
Registered for Transmission Abroad] 
(All Rights are Ree 
Fourth and very much enlarged Edition, 70 Plates, 4 Coloured, 21s. 
HOW TO WORK WITH THE MiCRO- 
SCOPE. By Dr. LIONEL BEALE, F.R.S. 
HARRISON, Pall Mall. 
NEW WORK BY DR. BEALE, F.R.S. 
Second Edition, 6s. 6. 
PROTOPLASM; or, LIFE, MATTER, 
MIND. Ejght coloured Plates, with a new Section on MIND, [Vis day. 
JOHN CHURCHILL & SONS. 
SCHOOL OF CHEMISTRY, 
GREAT MARLBOROUGH STREET, 
LONDON, W. 
DIRECTED BY ARTHUR VACHER. 
IMPROVED MAGNETO MACHINE.— 
“Mr. BROWNING, of the Minories, has just introduced a magneto 
machine of novel form and arrangement, in which the disadvantages of the 
old machines have been completely removed. ‘Two armatures are supplied 
with each machine. With the quantity-armature the following effects can be 
produced :—Half an inch of platinum wire, placed between the poles at E, 
can be made white hot in a few seconds. An induction coil may be made to 
give off bright sparks or illuminate small induction tubes. Bells may be 
rung, or telegraphs worked, even at a distance of many miles. Water or 
chemical salts may be decomposed. With the intensity-armiture, Abel’s 
fuzes may be fired, and most powerful physiological effects may be produced. 
‘he power of the shock-current may, however, be modified to any extent at 
the wlll of the operator. For any purpose, the effects of a moderately-power- 
ful voltaic battery may be produced, without the trouble and inconvenience 
attending the use of batteries. ‘he instrument is elegant in appearance, 
and always ready for instant use.” —Student, January 1869. 
Price, with 2 magnets and changeable armatures, £6 tos. Ditto, with 4 
magnets in mahogany case, very powerful, 410 tos. Illustrated circular for 
stamped envelope. JOHN BROWNING, Optical and Physical Instrument 
Maker to Her Majesty’s Government, the Royal Society, the Royal Obser- 
vatory, &c., &c., 111, Minories, E., London. Established 100 years. 
Now ready, crown 8vo, price 1s., 
AN INTRODUCTION to the Study of 
CHEMISTRY, written for the People. By CUTHBERT C. GRUNDY. 
The author has attempted to give a short and simple explanation of the 
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those who have but little time and very limited means for the acquisition of 
eecwledec, London: Simpkin, Marshall & Co. Manchester: Johuson & 
Rawson. 
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