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.