Morning journal and courier., 1888-10-24
curvature is very small in front of a hurri-

I cane.
 Great care must be taken not te appI, this rule to an increasing trade wind with falling barometer, as will be explained here after. In the rear of hurricane, on the contrary, the vortex may bear twelve or ever
 more points to the right or left of the wind
 because the wind is very much ineuryed in that part of 8 hurricane. ship should, therefore, always then lie to till the barome- ter begins to rise and the weather to in- prove, otherwise she will probably run right into the vortex. She might easily scud len knots while the hurricane might not be ad- vancing more than five miles an hour, so that it is very easy to catch up the vortex The discovery of this great incurysture is one of the most important modern develop Menta of &he subject. It used to be thought that if the wind increased in force, without changing in direction, with falling bsrome- ter, ship must necessarily be in the line of progression of the vortex, and that she should run at once. This was owing to the idea that hurricane was an isolated distur- bance. Now we know that if it is only the usual trade wind which increases without changing in direction, and with falling ba- rometer ship should lie to till the mercury has fallen at least six-tenths of an inch be- fore she runs as 8 last resource. The author has proved that hurricane is usually em- bedded in some prevailing trade or monsoon, and that there is, therefore, 8 belt of inten- sifed trade wind outside the true storm field This belt is always on the side of the hurri- cane furthest from the equator. A ship in this belt experiences an increasing trade without change of direction, and with 8 fall- ing barometer, thoug gh she may be far away from the line of progression of the vortex She would equally experience an increasing and unchanging wind, with falling barom- eter, if she were in the line of progression: but as there is no means of knowing wheth- 1I,o S-s s,, .E- the belt of intensified trade, ths empirical rule says lie to till the mercury has fallen six-tenths of an inch before beginning to run.
 The old rules for finding which seni-cir- cle of hurricane ship may be in, and the old rules for heaviDg to in either hemisphere, are all proved to be both true and valuable follows: Facing the wind in both hemis. pheres, if the wind changes by the right the ship is in the right hand semi-circls, and she should heave to on the right or starboard tack. If the wind changes by the left she is in the left semi-circle and should heave to on the left or port tack. If circumstances com- pei her to run she should keep the wind well on the starboard quarter in the northern hemisphere, and well on the port quarter in the southern hemisphere. It is much to be that the examination papers of the Board of Trade for masters and mates are behind the modern standards of knowledge, and that in these matters the Germans and other nations are now ahead of England. The whole knowledge which is required in our merchant service is contained in six questions, and candidate is expected to say that the center bears eight points or perhaps little more from the direction of the wind, while no notice is taken either of the small incurvature in front or of the great incurvature in the rear, or of the belt os in- tonaifiaa frado Uh fho ncnaI in4ioof;nno of being exactly in front of the vortex fail.
 In the discussion Professor Archibald said he considered that much good could be efr fected if the theorists would consider the question of hurricanes with view to help- ing those who have actually had to deal with them, and he also considered that many ships have been lost by following rules. As far as he could see the rule given by Mr. Abercromby in his paper seemed to be 6 safe one.
 Mir. W. N. Shaw thought it possible to ex- plain the formation of cyclones by assuming that there is a well marked line of the high- est temperature, and the air rushes in from directions at right angles to this line. These two air streams have the motion of the line of highest temperature superposed upon their own, and the result is @ spiral motion CT cyclone. He pointed out that this theory would fully account for the abnormal changes of weather observed in hurricane.
 Mir. Abercromby, in reply, thought the idea of the air being drawn down in toward the high temperature line could not be main tained, because in cases where the circum- stances of the formation of cyclone are known there are no traces of such aspira- tion of the air, and consequently in cases where aspiration occurs no cyclone follows. He did not think any theory of the forma. tion ot the cyclone existed which would ac- count for all the facts
 
 stIt's only question of time," and short time, too, as to when your rheumatism will yield to HOod'a SarsaDariIla Try it