SCIENC 
NEW SERIEs, 
VoL. X. No. 258. 
Fripay, DrcemBer 8, 1899. 
SINGLE COPIES, 15 cTs. 
ANNUAL SUBSCRIPTION, $5.00 
QUEEN Cd 
ot 
This instrument which we 
have just received from our 
instrument works marks an- 
other step in the develop- 
ment of our Continental line 
of microscopes. The instru- 
ment is intended to meet the 
Tequirements of students in 
laboratories of normal and 
pathologic histology, botany 
or general biology. The 
instrument is well - made 
throughout. The fine ad- 
justment and rack and pinion 
are perfect in their action. 
2 
New Queen 
t/,.” Oil Immersion 
Objective 
In the last three months we 
have made a change in the 
formula of our 1/;2” objective 
which has made it the best 
moderate - priced objective 
that can be obtained for bac- 
teriological work. We shall 
be pleased to submit this 
objective for examination to 
all those who are interested. 
Curt 1-3 ACTUAL SIZE SHOWING OuTFIT No. 3157 
QUEEN & CO., Inc. 
Optical and Scientific Instrument Works 
New York Office 
59 Fifth Avenue 
1010 Chestnut Street 
PHILADELPHIA 
