NATURAL HISTORY MISCELLANY. 255 
Messrs. Editors of the American Naturalist :—In answer to your question 
` in regard to the.above communication, I would say that while fully con- 
h D 
f the opinion that he (Dr. Higgins) has either made an error in 
his measurement of amplification (210 diameters with the No. 1 or A eye- 
pu or that the 4-10th objective is very much — in magnifying 
power. All of Mr. Wales’ 4-10th objectives ess Ihave seen have been 
as near or nearer 1-4ths than 4-10ths in magnifying power; quin below I 
give a table of amplification of such 4-10th objectives as are at hand; also 
two 1-4ths for comparison : 
MAKER. ANGLE OF AP. EYE-PIECES. 
1 2. 8 
4-10 J. Zentmayer, " T - " 75° 130 210 400 
se I and Tip ee ite AA es 2 
« Ww. Wales. dp Y? 110* 175 300 535 
1-4 R.B. Tolles * È 4 $ 120° 200 325 615 
* Smith and Heck, ME ar es cd 75° 210 340 650 
measurements were made with a first-class stand and eye-pieces of 
some uniform standard adopted by the different makers of objectives, 
so that the 1-4th of one maker may not be as high as the 1-6th of another 
maker; or a 4-10th of one be as high as a 1- 4th of another; or, still worse, 
a 3-inch objective of one maker of precisely the same power as à 2-inch of 
another maker, which was just the case with two objectives which I had 
about one year since. If the objectives did not differ any more than the 
first three in the above table it would be an improvement. The amplifi- 
cation which Dr. Higgins gives to his 4-10ths is as fig as the highest 
1-4th in the above table. — EDwIN BICKNELL, Salem. 
ANTHROPOLOGY. 
HE Bone Caves or GIBRALTER. — The four Genista Caves, Martin's 
Cave, St. Michael's Cave and some others, have yielded evidences of early 
man, in the form of osseous remains, associated with flint vantages s dn 
stone axes, polished and chipped; worked bones, servin 
h , needles and gouges; anklets or armlets of dii sates 
potte eden rubbing-stones and charcoal With these were found 
mains of numerous animals,* including Rhinoceros etruscus, Rh. lep- 
torhinus i (extinct); Equus, Sus priscus (extinct); me scrofa, Cervus ela- 
Those marked thus §, are abundant; and d thus 88$, very abundant. Asingle molar of 
Bopha antiquus was obtal ined m many years since by the late Mr. James Smith, of Jordan Hill, 
hed) at Europa Point, tl I extremity ot the roc 
