----+---------+---------+--------+----------+-------+-------+--------- No.| Glucose.| Dextrin.| Starch.| Moisture.| Gum, | Ash. |Acidity. | | | | | &c. | | ----+---------+---------+--------+----------+-------+-------+--------- | | | | | | | cc. 1 | 8.92 | 81.57 | 1.99 | 10.12 | None | 0.207 | 57.3 2 | 7.19 | 71.46 | 13.13 | 10.40 | None | 0.120 | 44.8 3 | 1.29 | 69.42 | 24.72 | 4.17 | 1.12 | 0.280 | 5.22 4 | 8.40 | 60.98 | 10.98 | 10.09 | 9.02 | 0.530 | 20.0 5 | 10.60 | 44.98 | 8.05 | 12.20 | 23.57 | 0.600 | 52.0 6 | 14.80 | 11.57 | 36.46 | 34.87 | 1.89 | 0.580 | 8.0 7 | 8.00 | 29.61 | 26.78 | 33.98 | 0.88 | 0.750 | 88.0 8 | 2.29 | 52.38 | 37.65 | None | 7.335 | 0.315 | 9.6 ----+---------+---------+--------+----------+-------+-------+--------- In those cases in which the substitute is made by admixture with gelatin or liquid glue the quantity of other organic matter obtained can be checked by a Kjeldahl determination of the total nitrogen. If a natural gum is added, it will be partially converted into sugar when the filtered liquid is inverted, and so make the dextrin determination slightly too high. * * * * * MR. CAILLETET'S CRYOGEN. The "cryogen," a new apparatus constructed by Mr. E. Ducretet, from instructions given by Mr. Cailletet, is designed for effecting a fall of temperature of from 70° to 80° C. below zero, through the expansion of liquid carbonic acid. The apparatus consists of two concentric vessels having an annular space between them of a few centimeters. A worm, S, is placed in the internal vessel R. All this is of nickel plated copper. The worm, S carries, at Ro', an expansion cock and ends, at O in the annular space, R'. A very strong tube is fixed to the cock, Ro', and to the ajutage, A'. It receives the tube, Tu, which, at the time of an experiment, is coupled with the cylinder of carbonic acid, CO². A tubulure, D, usually closed by a plug, Bo, communicates with the inner receptacle, R. This is capable of serving in certain experiments in condensation. The table, Ta, of the tripod receives the various vessels or bottles for the condensed products. The entire apparatus is placed in a box, B, lined with silk waste and provided with a cover, C, of the same structure. Apertures, Th, Ro, and T", allow of the passage of a key for acting upon the cock, Ro', as well as of thermometers and stirrers if they are necessary.