Analyses of Books. 
[April, 
266 
.hich Science he. pieced » ^ " 5SSK 
"trSeceon'. w.ch open, wiih 
rod, or, we might rather say, P S That Dr. Franklin’s in- 
with especial reference to j, meted out t0 a u disco- 
vention met with the opposi .. originators, is matter of 
lesrshow^il? Piiritar^New^ngland than in ^It 
mmmmm 
Cel Mnidemnation of pei,,, $1^’^ 
country^ of Science being thus formally insulted in . the person of 
Ughtnlg proSn. The theory, he shows, is simplicity itseK 
AU that is required is to establish such condition as to lead 
flaQh of lightning that may strike the house 
Snfto btproteaed, without giving it the opportunity for 
j 5 Tn other words, the conductor must form the hn 
f^t resistance ” between the summit of the building and the 
A 'Rnt to carry out this principle into practice requires n 
S of XK jodgmc... V/Tbi'S,” 
.• p as is too often the case, the conduaor will be faulty, or 
r a f even be worse than none at all. Among the besetting sms 
of conduaors we find it pointed out that the metal may be defi- 
• nt in thickness- that its continnity may be interrupted .that 
in obedience To a gross error it may be isolated from the building 
it is to protect by means of glass supports ; that it may . 
placed in connexion with metallic masses in or ’ 
[uch as leaden or zinc roofing and gutters, water and gas pip , 
