Notice of Quekett’s Treatise on the Microscope. 67 
bee 
ea eether suppressed, the full-length imaginary portrait of the 
a 
Rue, who discovered “ depressions or perforations” where none 
existed, is omitted, and were it not that in the list of test-objects 
furnished by Mr. Topping, the N. Spenceri appears, shorn of its 
Latinity, we should have no knowledge that any such optician 
ever existed. And yet it is a matter of record that the humble 
little shell which bears his name, from his having first resolved 
it with his own lenses, puzzled the bravest of the English mi- 
“roscopists for several weeks, after it had been thoroughly resolved 
on this side the Atlantic. We say that we might have expected 
“ome notice of Mr. Spencer in the list of the “ soe foreign” 
foscope makers, but the meagre account given of other prin- 
ripal makers reconciles us to the omission.——Mr. Spencer has 
been guilty of the unpardonable fault of teaching op- 
Ucians Something—that 135° was not the “largest angular pen- 
cil that can be passed through a microscopic object-glass,” (1st 
wh 431,) but that it might be increased to 160°, and lately 
od ps 
and then « generally mounted dry”! (p. 411)—and that ‘lines 
‘than the ;;',,; of an inch apart, were by no means “ near 
to the utmost limit that the position of a line can be ascertained.” 
(1st ed, p. 442.) For these and similar offences, Mr. Spencer’s 
name and occupation have been suppressed. at 
