[65] Ammoniac generated at a temperature above that of the atmosphere, always deposits ammoniacal solution during its reduction to the common temperature.
[66] By the introduction of aëriform ammoniac into the exhausted globe.
[67] Additional Observations, page 107.
[68] It is necessary in these experiments, that the greatest care be observed in the introduction and extraction of the capillary tube. If it is introduced dry, there will be a source of error from the moisture adhering to it when taken out. I therefore always wetted it before its introduction, and took care that no more fluid adhered to it after the experiment, than before.
[69] Previous to those experiments, I had made a number of others on the combination of ammoniac with water.—My design was, to ascertain the diminution of specific gravity for every three grains of ammoniac absorbed; but this I found impossible. The capillary tube, when taken out of the phial, always carried with it a minute portion of the solution, which partially evaporated before it could be again introduced; and thus the sources of error increased in proportion to the number of examinations.
[70] The expansion from increase of temperature is probably great in proportion to the quantity of ammoniac in the solution.
[71] From the combination.
[72] I had before proved that at this temperature the salt neither decomposed nor sublimed.
[73] A particular account of the experiments from which these facts were deduced, was printed in September, and will appear in the first volume of the Researches.
[74] And which will be published, with an account of its perfect decomposition at a high temperature, in the Researches.