216 Analyses of Books. [Marcu, 
ether, oil of turpentine, and naphtha. The following table exhi- 
bits the results which he obtained. 
' Ether. Alcohol, Sp. Gr. 0°813. Naphtha. \Oil of Turpentine 
Temp.) Elast. | Temp.| Elast. Temp. Elast. | Temp.| Elast. |Temp., Elast. 
——— | —_— |——$—$———— TD 
34° 6°20 | 32° 0:40 |173-0°| 30°00 | 316° | 30:00 | 304-69} 30-00 
44 8:10 | 40 0°56 |178°3 | 33°50 | 320 31°70 |307°6 | 32°60 
54 10°30 |} 45 0-70 |180°0 | 34:73 | 325 34:00 |3100 | 33°50 
64 13°00 | 50 0-86 |182°3 | 36-40 | 330 36°40 |}315°0 | 35-20 
74 16°10 | 55 1-00 | 1853 | 39°90 | 335 38°96 |320°0 | 37°06 
84 20°00 | 60 1-23 |190°0 | 43°20 | 340 41°60 | 322-0 | 37:80 
94 24°70 | 65 1°49 |193°3 | 46°60 | 345 44:10 |326-:0 | 40-20 
104 30°00 |} 70 1:76 | 196-3 | 50°10 | 350 46:86 |330°0 | 42-10 
2d Ether,} 75 2°10 |206°0 | 53:00 | 355 50-20 | 336-0 | 45:00 
105 30:00 | 80 245 | 206-0 | 60°10 | 360 53+30 |340°0 | 47:30 
110 32°54 | 85 2°93 |210-0 | 65°00 | 365 56-90 |343:0 | 49°40 
115 35°90 | 90 3:40 |214:0 | 69°30 | 370 60-70 }347:0 | 51-70 
120 39°47 95 3°90 | 2160 | 72°20 | 372 61-90 |350°0 | 53-80 
125 43°24 | 100 4°50 |220:0 | 78°50 | 375 64:00 |354-0 | 56-60 
130 AT-14 | 105 520 | 225-0 | 87°50 357°0 | 58-70 
135 51°90 | 110 6°00 |230°0 | 94:10 360-0 | 60-80 
145 62°10 | 120 8°10 | 236-0 | 103-60 
150 67°60 | 125 9°25 | 238-0 | 106-90 
155 73°60 | 130 10°60 | 240-0 | 111-24 
160 80°30 | 135 | 12°15 | 244-0 | 118-20 
165 86:40 | 140 | 13:90 | 247-0 | 122-10 
170 92°80 | 145 | 15°95 | 248-0 | 126-10 
175 99°10 | 150 18-00 | 249-7 | 131-40 
180 | 108:30} 155 | 20°30 | 250-0 | 132°30 
185 {116:10'} 160 | 2260 | 252-0 | 138:60 
190 | 12480 | 165 | 25-40 | 254°3 | 143'70 
195 | 133-70 | 170 | 28°30 | 258°6 | 151-60 
260°0 |155°20 
262-0 |161°40 
264:0 '166-10 
140 56°90 | 115 710 | 232:0 | 97 LO 362°0 | 62-40 
Dr. Ure remarks, that the discrepancies im our systems of 
chemistry respecting the boiling point of oil of turpentine are 
ludicrous. Dr. Murray makes it 560°, Mr. Dalton under 212°. 
He himself states the boiling point at 316°. He does not take 
any notice of my estimate of that point. Had he looked into the 
first volume of my System of Chemistry (5th edit.), p. 100, he 
would have found the boiling point of oil of turpentine stated on 
the authority of an experiment of my own at 314°. The two 
degrees of difference between his estimate and mine were owing 
no doubt to the difference between our thermometers. Mine 
was a standard thermometer made for me by Mr. Creighton. 
From Mr. Creighton’s mode of graduating thermometers, it is 
obvious that in the higher parts of the scale, the degrees are 
below the truth. Thus mercury boils, as determined by his 
thermometers, at 556°: the real boiling point, as determined by 
Dulong and Petit, is 580°. It is probable that Dr. Ure also 
employed a thermometer made by Creighton. But it is unlikely 
that it should be better than mine, as Mr. Creighton was at great 
