150 Scientific Intelligence. 
Lor actually obtained from albumin in this way, remarking that 
may be much more readily prepared it this substance than 
pote indigo-blue. For this purpose 300 sr ms commercial albu- 
min was mixed with 44 liters spring water, and an ox-pancreas, 
carefully freed from blood and fat, and ge — was ad “eo 
es beaker, covered with a glass plate, was kept at 40°-50° 
xty or seventy hours. The liquid was then sbdled, panties 
pa A cloth, acidulated with acetic acid to retain the excess 
albumin in solutio n, and distilled on a water bath to one-fourth 
its volume, The filtered and acid distillate was rendered era 
with dry slacked lime and extracted with an equal volume of 
ether; the ether, on distillation, left having the characteristic odor 
of indol. Mixed with water it became erystalline, and recrystal- 
lized from water, : fused at 5 Elementary analysis confirmed 
it as indol. The amount sia was about 0°3 per cent of the 
albumin employed. — Ber. Berl. Chem. Ges., vii, 1593; viii, sii 
336, March, 1875 
6. Collodion Films.—M. E. Griron states that if soleaide is 
poured on a very clean plate of glass, the film may be separated 
when dry and stretched on a frame. Its surface is polished, and 
it reflects light like glass; it hiketes by reflection and by refrac- 
tion, the angle of maximum polarization being 56° 25’, correspond- 
ing to an index of refraction of 15 108, or a little less than crown 
lass. From this index we can, by observing. the pee et 
fringes, calculate the re with a result varying from *0081 
‘0088 mms. So thin a film cuts off but little rate heat. With 
tension when gh fenton: apecily to sunli cht. * Their diathermancy 
is much greater than that of s of mica, and though more fragile, 
sonata ~ chic repaired, Two sets, each consisting of six collodion 
nsmitted when seeecd only 66 as much heat aye when 
placed Satalteh A pile of nine films being placed before a Nicol’s 
as found to polarize ‘6 to -7 of the heat .— Comptes + Rend, 
oa 889, 
7. €C eben ton OF Hxph osive Mixtures. —M. NEYR oles "bas 
tube. First, i using tubes carefully dried, and ete by 
covering the interior with ne. In the first case the steam 
ensing on the colder portions leaves transparent the parts 
Ne the flame in vibra has m ted. These 
ea 7 
rtions are, on the other hand, shown in the second case by 
the melting of the paraffine. It is indispensable that the combus- 
tion shall not be too rapid ; and further, to obtain the best effects 
