Principles and
章节目录
共 54 段- =6. Silicon= never occurs in the free state, but combined wi
- Large quantities of this guano are also due to the débris of
- ORIGINAL MINERALS.
- Owing to the fact that their chief constituent, carbonate of
- =43. Action Of Vegetable Life.=—The preliminary condition to
- =51. Vegetable Soils.=—The heavy soils whose origin has been
- First of all, according to this authority, it is necessary t
- A square sample hole is dug with a spade having its sides pe
- The essential conditions to be observed are the proper sifti
- The test tube E is first filled with the substance, whose sp
- =123. Summary of Data.=—If a solution of a soluble sulfate,
- It will be seen that there was no absorption in the case of
- The empty part of the upper glass tube is now filled with wa
- Depth in Date. Per cent Pounds per Increase or decreas
- The lysimeters of the other pair, which are the same size as
- These compounds are probably destroyed or changed in the pre
- Make the duration of the subsidence such that the liquid dec
- One kilogram of the soil previously dried in the air, is tak
- This expression signifies that in a given case, the velocity
- =222. Method of Hilgard.=—Two important principles lie at th
- =234. Statement of Results.=—A complete silt analysis of a s
- In these experiments the time of boiling was prolonged in or
- =249. Microscopical Examination.=—The direct examination of
- =260. Petrographic Examination of Silt Particles.=—The large
- =272. Method of Wülfing.=—A somewhat more convenient method
- The method of calculating the results is shown in the follow
- =290. Preliminary Considerations.=—The sample of soil intend
- _The Strongly Combined Water._—Water which, at a temperature
- Organic
- In a small flask, with flat bottom, containing about 250 cub
- Specific gravity of
- (4) _Estimation of Iron and Alumina._—The iron and alumina p
- =349. Condition of Potash in Soils.=—Potash exists in the so
- If it is desired to adopt a general method for the determina
- According to the presumed richness in calcium carbonate vary
- =370. Estimation of Iron.=—Iron, in general, is quite abunda
- =376. Petermann’s Method for the Estimation of the Phosphori
- _Estimation of Sulfur as Sulfids._—The sample is distilled w
- It is seen that the action still continued after forty days.
- A well-cleaned glass combustion tube, closed at one end, is
- _Earth Employed._—One kilogram of sandy clay containing tota
- It is now generally conceded that the action of the nitrous
- More recent instructions by Winogradsky for preparing the ge
- A subculture from solution No. 2 of the first dilution menti
- 8. The decomposition of nitrates with the quantitative evolu
- The chief source of error attending the oxygen process lies
- The volume of air under the observed conditions which would
- In the first class of processes the reduction and distillati
- A is a small, round-bottomed flask, into the neck of which a
- The phenylsulfuric acid should be prepared some time before
- One of the side tubulures carries a burette, B, containing f
- =515. Estimation of the Chlorin.=—The chlorin in the solid r
- Another proof that both phosphorus and sulfur are present in
- Rowland, fall of particles in liquid, 180