348 



PROCEIWlNai^ OF THE NATTOyAL MT'^ilJCM. 



VOL. 49. 



the sole item of importance, nor indeed the item of most importance. 

 It will bo noted that in some instances a stone losing a certain amount 

 still retains a nearly smooth surface and sharp arrises. Others become 

 roughened, granules loosened to the point of falling away, and the 

 arrises as a consequence left ragged. In some of the stones there is 

 a tendency for the smaller interstitial crystals to disappear, leaving 

 the larger standing in relief. The Tennessee samples tested are of 

 the gray and pink spotted varieties. In these tlie tinted calcite, 

 which, judged from the forms, represents fragmental fossil material, 

 is more refractory than the colorless and is left in slight relief. In 

 the case of the oolitic limestones the oolites are eaten out, leaving 

 the crystalUne or interstitial material and the fossil fragments in 

 relief, the outline of the oolite being sometimes preserved by the 

 insoluble impurities. Tlie considerable amount of insoluble material 

 set free from these oolitic cubes during the trial settling to the bot- 

 tom of the jar as mud or remaining to be brushed off the surface 

 when the cube was dried seems to have come wholly from the oolites, 

 and not from the interstices. It will be noted, as might have been 

 expected, that the dolomitic marbles were not appreciably affected 

 and that the oolitic stones lost during the trial an amount two and 

 three times as great as that of any other of the stones tested. In 

 but one instance was there any marked change in color in any of 



the s amities. 



TABLE I. 



PRELIMINARY TRIAL EXTENDING OVER PERIOD OF 70 DAYS. 



Kind and localitv. 



White crvstalline limestone: 

 Marble, S'lilo, Colorado. 



White crystiilline liinpstonc: 

 Marble, Picliens County, ( leor- 

 gia. 



White c^^'stalline limestone: 

 M!irl>lP, \VeRt Orovo, Penn- 

 sylvania. 



rinlv crvstalline limestone: 

 Marble, Knoxville, Tennessw. 



Gray crystalHne limestone: 

 Marble, Concord, Tennftssee. 



White crvstalline limestone: 



Marble, Jutland, Vermont. 

 Blue crvstalline linuvstone: 



Marble, "Jutland, Vermont. 

 White crvstalline limestone: 



Marble, Carrara, Italy. 

 White crystalline dolomite: 



Marble, Cbcl^evsville, Maryland 

 White cr>-stallino dolomite: 



Marble, 'Piickahoe, New York. 



Oolitic limostono, Bedford, Indi- 

 ana. 



Oolitic limestone: 

 Green, Kentucky. 



Bowling 



Weight 

 before 

 trial in 

 grams. 



Or)3 

 313 



393.5 

 747 



701,''. 



4-IS.') 



•178 



/ 40. f>o:).''> 



\ 41.1245 

 / 44.444 

 \ i\.0:M 

 j 3S.C. !(■).■) 

 \ 40. ,5885 

 / 38. SO 

 \ ;!(i. 507 

 / 42.06.55 

 \ 41.405 



/ 43.5785 

 \ 41.1475 



Weight 



after 

 trial in 

 grams. 



i f 41.1655 

 \ 37. S355 



44. 7075 

 43.8815 



41.0,35 

 42. 3565 



46. 2345 

 44. ,586 



40. 904 

 47.9725 



40.1185 

 40. 432 

 43. 83.55 

 40. 589 

 .38. 114 

 40. 05)25 

 38. 7755 

 36. 4855 

 42.0415 

 41.3795 



42. 2435 

 39. 8795 



40. .504 

 37. 1725 



l.oss of 

 weight 

 in grams. 



0. 3455 

 0. 4325 



0. 4,585 

 0. 3905 



0.1110 

 0.11.55 



0. ,5445 

 0. .5055 



0. 6310 



0. ,547 

 0. 6925- 

 0. 6tV85 

 0. 4665 

 0. ,5025 

 0. 496 

 0. 02;) 

 0.0215 

 0. 0240 

 0. 02,55 



1. 335 

 1.268 



0.6115 

 0. 663 



Percent- 

 age loss 

 of weight. 



0. 0077 

 . 0097 



.011 

 .009 



. 0024 

 . (M)2« 



. 0108 

 .0104 



.012 



.013 

 . 016 

 . 015 

 .011 

 .013 

 .012 

 . (VK1t'.2 

 . (K)().58 

 . IKX)56 

 . 0(X)6 



. 0304 

 . 0308 



.014 

 .017 



Heniarks. 



Very slightly roughened; no 

 granulation. 



\Slightly roughened; no 

 granulation. 



>l'"-fTect scarcely appreciable. 



(White portions slightly 

 etched, leaving the pink 

 standuig in relief. 

 White portions slight Iv 

 etched, ioavinp the pink 

 standing in relief. 

 ISurfaces appreciably rough- 

 / ened. 



ISurfaces appreciably rough- 

 / ened: no granulation. 

 ISurfaces appreoiablv rough- 

 / ened; like white kutland. 



Not appreciably acted upon. 



Not appreciably acted upon. 



Pistiiictlv roughened and 

 pitted, the fossil fragments 

 l(>ft standing in relief. 



Distinctly roughened and 

 pitted," the oolites being 

 eaten out, leaving .sur- 

 face covered by circular 

 and oval pits often with a 

 slight residual eminence iu 

 center. 



