314 _ The American Naturalist. [April, 
Fossil Bones.—The following tables give the result of corre- 
sponding tests upon fossil bones, for comparison and to ob- 
serve the modification produced by fossilization : 
2 g TA Ə 
8 = S p 3 3 E 
ae n D m Ee 
ee lec S cles | pe aS 
» Ò Ba b> 2 ne a on 
S A : Bs B= g 
a £ 2 3° page) g ge 
G3 E r e | £ aa 
431388 E R pen 23 
ae |=) 2 te oo; | G 
gO E H a g FA 4 GEIE = 
vajag] a? jas | ee | ae 
; Sg siesis? EA «8 
Complete Analysis. 3 8 ae daro 3o ae 
> Q Oo; Set os 
ge | =| 8885 | $9 | es 
Qa 08} eee | oe | ab 
aq v SR g Se . 
13 88 S lees\ ce | es 
a3 È S Sah 23 48 
sel Sei sPlioeo; St | os 
op o8,| og EDE SS 2 
os| 2A | 2% PSs! Sul BS 
Sdi gn] os Peal a2 | 4 
ag Ag Re 25/4) A8 
AD aig | oo BEE) 62 | oa 
3 | 5 | Me) 2 3 
osphate of Lime... . | 64,63. | 79,05 | 68,53 | 12,90 |... 67,70 
Phosphate of Magnesia 1,97 | 0,65 27 
Phosphate of Iron (P,0°F*e0')......... 9,63 | 1,84 68 | 4,98 |: 0,62 iini 
Peroxide of Iron 7,10 
Fluoride of Calcium 0,88 | 1,70 | 3,82 | 3,42 traces| 5,31 
Chloride of Calcium.. ............sss00+, 0,44 | 0,48 0,3 
Carbonate of Lime............0se0++++ -+| 21,20 | 15,98 | 15,68 | 51,56 |...-.-+5 15,01 
ilica.. 0,75 | 0,10) 0, 
Sulphide of Iron (FeS?) 24,92 
Sulphate of Lime ,23 
Silica and Clay 1,57 
Quartz seetecsone | 98,45 |....ceece 
Organic matter. | 5,67 
Loss on ignition | .... 0,88 s.sseseso 
TOt aes evscscces| 99,50 ‘99,30 99,63 99,83 99,95 100,79 
*Note.—There remained of this only a thin crust of phosphate of iron, 
the central part was formed of crystals of quartz enveloped in a gray-blue quartz- 
“ mass, traversed by gray veins that served to bind together the phosphated en- 
.velope. rg j t á : p . | 
It is to be remarked that the first four analyses report only 
the mineral portion of the substance, the organic matters hav- 
ing first been abstracted; while in the last two, the organic 
