{xlii} A TABLE OF LATITUDE AND LONGITUDE,
| Places of Observation | Latitude N | Longitude W. from Greenwich | Longitude W. from Washington City |
|---|---|---|---|
| Shippingsport, Ky | 38° 15´ 23˝ | ||
| Camp on Mississippi, June 8 | 38 26 09 | ||
| Mouth of Merameg river | 38 23 39 | ||
| St. Louis, Missouri | 38 36 18 | 90° 02´ 35˝ | 13° 02´ 35˝ |
| Camp on Missouri river, June 28 | 38 34 33 | ||
| Franklin, Missouri | 38 57 09 | 92 57 05 | 15 57 05 |
| Fort Osage, Missouri | 39 09 33 | ||
| Cow Island, Missouri river | 39 25 05 | ||
| Camp on Missouri river, Aug. 31 | 39 49 01 | ||
| Fort Lisa, Missouri Fur Co.'s Establishment | 41 24 13 | ||
| Engineer Cantonment | 41 25 04 | 95 43 53 | 18 43 53 |
| Mouth of river Platte | 41 03 13 | ||
| Mouth of Elk-horn, tributary to Platte | 41 12 00 | ||
| Boyer river at commencement of High Lands | 41 32 15 | ||
| Elk-horn river, near Pawnee Trace | 41 26 07 | ||
| Village of Republican Pawnees | 41 17 03 | ||
| Mouth of Missouri river | 38 51 39 | 90 00 40 | 13 00 40 |
| Mouth of De Moyen river | 40 21 48 | ||
| Mouth of Illinois river | 38 58 23 | 90 18 00 | 13 18 00 |
| Cape Girardeau, Mississippi river | 37 18 39 | 89 17 00 | 12 17 00 |
| Spanish Fort at Natchez | 31 33 45 | ||
| Camp on the Platte, July 4 | 39 57 40 | ||
| Do. do. July 5 | 39 50 40 | 105 20 45 | 28 20 45 |
| Camp at the base of the Rocky Mountains, July 8 | 39 23 40 | ||
| 1st Camp on Arkansa, July 17 | 38 18 19 | 105 39 45 | 28 39 45 |
| Camp on Arkansa, July 19 | 38 14 18 | ||
| Camp where Exploring Party separated | 38 12 22 | 103 46 15 | 26 46 15 |
| Camp on Canadian river, Aug. 6 | 35 16 19 | ||
| Do. do. Aug. 22 | 35 26 29 | ||
| Do. do. Aug. 31 | 34 57 35 | 96 33 00 | 19 33 00 |
| Do. do. Sept. 9 | 34 50 15 | ||
| Belle Point, Arkansa Territory | 34 50 54 | 94 21 00 | 17 21 00 |
METEOROLOGICAL REGISTER
Preliminary Explanations
The observations on the modifications of the clouds were particularly detailed in the Journal by Mr. Say, who being often remote from the party on detached expeditions, the phases observed by him cannot always be considered as precisely corresponding with those that occurred where the observations noted in the remaining columns of the tables were made by Lieut. Graham. As they would occupy too much space, if introduced into the body of this work agreeably to the manuscript notes, it was judged proper to modify and condense them into the smallest possible space. With this view, the nomenclature of Messrs. Howard and Forster has been adopted, and is now inserted in the meteorological tables, under the indications of the following abbreviations, viz.
| S | - Stratus. |
| C | - Cirrus. |
| Cs | - Cirrostratus—the addition of a full point, thus Cs. shows that this cloud was almost or entirely universal; and a comma, thus, Cs, indicates its partial occurrence. The same observations also relate to the signs for the following clouds. |
| Cm | - Cumulus. |
| Cml | - Cirrocumulus. |
| Cms | - Cumulostratus. |
| Cmc | - Cumulocirrostratus. |
| Ns | - Nimbus. |
But as the particular varieties of appearance which these respective clouds exhibited, could not be indicated in the allotted columns of the tables, they are altogether omitted. The column headed with the word courses indicates the points of the heavens from which the clouds proceed; thus | C. | S.W. | shows the occurrence of the Cirrus form of clouds proceeding from the south-west.
The letter L. sometimes inserted in the column of remarks on the state of the weather, indicates lightning; T. thunder, and R. rain.
Observations, by means of the Cyanometer, on the colour of the atmosphere, were also made, three times each day, by Mr. Graham; but as the instrument became imperfect in consequence of the fading of its colours, from the necessary exposure to the action of light, they have been rejected.
No record was made of the humidity of the atmosphere, as the Hygrometer provided for the use of the Expedition, proved entirely useless.