200 Scientific Intelligence. 
miles of Amherst College. _ Of these, three hundred and ninety five 
genera, and nine hundred and ninety seven species, are phenogamous 
plants ; while one-hundred and thirty six genera, and four hundred 
and fifty species belong to the class Cryptogamia. 
11. Agenda Geognostica. 
Translated by Prof. Fiske, and communicated by Prof. Hitchcock, of “Amherst 
A Help Book for travelling geologists, (mountain searchers,) and 
Guide to Lecturers on practical Geognosy, by Prof. Leonhard, Hei- 
dleberg, Germany. 
1. Introduction.—Scientific preparation for a journey : ex. gr. stu- 
dy of existing works, maps, collections, &c.—apparatus, mode of trav- 
elling, time of journey, determination of bearings, and selection of 
favorable points for observation, the collecting of specimens, diary; 
profiles, and yiews, geological maps. 
_ 2, Examination of the external relations and appearances of 
mountains.—General and particular geographical relations of the 
mountain to be examined ; direction, extent, height of hills and moun- 
tains, their separation from, or connection with others. 
Physiognomic relations 3} Mountain structure in general and partic- 
ular, direction and ramifications of chains, slopes, ridges, passes, 
interruptions by valleys and plains, &c. vegetation. 
» Limits of snow, glaciers, fountains, rivers, lakes, seas, volcanos, 
earthquakes. : 
. 3. Examination of the internal structure and relations of hills and 
mountains.—Existing rocks ; position, structure, relations, intermix- 
tures, transitions, changes produced by the atmosphere. . 
. Division of rock masses, by stratification, by separation, by fissures. 
_ Stratified arrangement ; alluvium, diluvium, tertiary, secondary, 
transition, primitive. . 
., Unstratified arrangement ; granite, syenite, porphyry, Sc. basalt 
dolerite, phonolite, &c. trachyte, lava, recent volcanos, &c. 
_ Metallic ‘Tepositories ; veins and beds, excavations, precipices, 
_ 4, Execution of a geognostic description—The geological reader 
will see that such an outline as this, filled up by so able a writer as 
the Councellor Von. Leonhard, must be an extremely valuable guide, 
ta.the examination of, rocks,.and. will only regret that so few observ- 
» #8 tn. this country, will be profited by it, unless some one shoulé 
its translation 
