REPORT OF THE SECRETARY. 25 



printed excepting the 9th and 10th. which are still in preparation, 

 and a part of the 7th, which haa been delayed on account of- the call 

 on Dr. LeConte to a position in the medical department of the army 

 of the United States. 



The instructions for collecting and preserving insects were published 

 in the appendix to the report for 1858. A new and enlarged edition 

 will be published during the coming year as a part of the next volume 

 of the Miscellaneous Collections. 



Another part of the Miscellaneous Collections is a series of tables 

 furnished by Professor Guyot in addition to the set of physical tables 

 by the same author, previously published by the Institution. The 

 first of these is intended for converting the klaftcr and feet of Vienna 

 into measures of length of other countries. They are to be substituted 

 for those contained in the former edition, because they are derived 

 from a new comparison of the klaftcr of Vienna and French toise, by 

 Von Struve and Von Littrow. This comparison has furnished the 

 standard adopted in the great trigonometrical survey of Austria. 

 The second set of tables is for converting the Spanish or Mexican 

 and Bolivian varas and feet into English and French measures. 



The preceding tables have been printed, and are inserted in volume 

 I of the Miscellaneous Collections. 



The third set of tables gives the value of a degree of the meridian 

 in every degree of latitude from the equator to the poles, in metres, 

 kilometres, German miles, nautical leagues, French leagues, geo- 

 graphical or nautical miles, and English statute miles. 



The fourth set of tables gives the value of each degree of longitude 

 on each parallel of latitude, from 0° to 90°, in the same measures as 

 those mentioned above. 



The two preceding sets of tables, which are based on Bessel's ter- 

 restrial elements, have been computed under the direction of Professor 

 Bache at the office of the Coast Survey, and have been kindly fur- 

 nished by him for this volume. The columns of the German miles and 

 nautical aud French leagues have been added to make the table more 

 complete. 



The fifth set of tables is for converting the most usual measures of 

 length into each other, such as myriainetrcs and kilometres, Austrian, 

 Prussian, and German miles, nautical leagues, French, Spanish, and 

 Mexican leagues, geographical or nautical and statute miles, and Russian 

 wersts. 



